Marval O’Farrell Mairal > Buenos Aires, Argentina > Firm Profile

Marval O’Farrell Mairal

Argentina > Banking and finance Tier 1

Marval O’Farrell Mairal‘s chairman, Santiago Carregal, leads the firm’s ‘outstanding’ and ‘versatile’ banking and finance practice alongside veteran banking specialist Gabriel Matarasso. With a team of more than 50 lawyers -including nine partners- at its disposal, the firm is able to deliver a full-spectrum service offering that covers all aspects of banking and finance law. A regular presence on big ticket bank M&A deals and sophisticated loans’ mandates, the team is equally adept at taking on complex forex, regulatory and financial restructuring matters; and -despite a challenging market- the practice continues to secure project finance, structured finance and capital markets work. A niche practice in Central Bank-linked litigation and a large portfolio of highly sensitive, non-transactional banking work add a further layer of differentiation. The ‘brilliant’ Roberto Silva Jr leads on the firm’s biggest capital markets engagements and is another notable name, alongside Cecilia Mairal, who is best known for handling challenging and frequently highly sensitive work for banks. Clients also make special mention of capital markets partner Juan Diehl Moreno, who works closely with financing specialist Hernán Slemenson. Sergio Tálamo, who has a strong track record in syndicated and bilateral loan markets, was raised to the partnership in August 2021; as was Francisco Abeal, whose practice extends to foreign exchange and currency control matters, 12 months later. Former partner Fernando Hernández  has departed for an in-house role with Globant. At associate level the team has experienced considerable change – in part a strong reflection of the training they receive at the firm: former senior associate Martin Lanus moved to Paul Hastings LLP in New York in October 2021, while semi-senior Agustin López Roualdes is currently undertaking his LLM at Columbia and fellow semi-senior Ezequiel Guerrero Setti moved to Banco Santander (March 2022). Associate Pablo Lapiduz arrived from JP Morgan in May 2021 but Cecilia Ramos moved in the opposite direction in May 2022, while Josefina Griot moved to Cleary Gottlieb Steen & Hamilton as an international associate in August 2022. Senior associate Manuela Lava is currently the key contact at associate level; with over 15 years at the firm she has particular knowledge of financial trusts, capital markets’ matters and fintech.

Practice head(s):

Santiago Carregal; Gabriel G Matarasso


‘The firm stands out for the professionalism of its partners.’

‘A team that is always at the cutting edge of the latest regulations in banking and capital markets, speeding up procedures.’

‘A good team with a lot of experience. There for clients 24/7.’

‘The team is versatile and has the capacity to analyse all the problems that arise, identify conflicts and bring in specialist expertise when required.’

‘They differ from the rest in that they have expertise in all areas of law. The advice is complete. An outstanding partner worthy of mention is Roberto E. Silva.

‘Marval is an outstanding firm that shows deep understanding of the law. In new areas like fintech the team always finds the delicate balance between traditional structures and taking risk.’

‘They are proactive, they understand the business and they understand their role as business enablers. I particularly highlight the work of Juan Diehl, Sergio Talamo and Ignacio Paz.’

‘The banking and capital markets team at Marval, O’Farrell & Mairal has solid training and is dedicated to supporting the clients.’

Key clients

Credit Suisse

BNP Paribas

JPMorgan Chase Bank


Goldman Sachs

Banco do Brasil

Bank of New York


Deutsche Bank


TMF Trust

Banco de Servicios y Transacciones

ICBC Argentina

Banco Galicia


Banco Supervielle

Banco Itau

Banco Comafi

Banco Industrial


Banco de Valores


Work highlights

  • Assisting Atento with financing to support its capital expenditure and working capital to increase its customer resource management and business process outsourcing operations.
  • Acted as Argentine counsel to German wind turbine manufacturer Nordex in obtaining refinancing from a consortium of lenders.
  • Advised the dealer managers and the placement agents regarding a liability management transaction by Aeropuertos Argentina.

Argentina > Bankruptcy and restructuring Tier 1

Marval O’Farrell Mairal is a go-to firm for complex cross-border restructuring and bankruptcy matters, with its New York office a key differentiator when supporting clients in cases heard before US courts. The practice is a consistent presence across all the major restructurings in Argentina and is comfortable handling in and out-of-court proceedings. The team will advise debtors and shareholders, but is best-known for its creditor-side work, and takes full advantage of its full service offering to provide support from overlapping practice areas including corporate, banking, litigation, tax and labour. Counsel Martín Campbell has more than 35 years' insolvency experience and leads a strong team that also includes disputes-focused veteran Julio César Rivera, judicial bankruptcy proceedings expert Gonzalo Fontana and banking and finance restructuring lawyer Roberto Silva. Banking and finance partner Ricardo Beller left to join PAG Law in May 2022.

Practice head(s):

Martín Campbell

Key clients

Avions de Transport Regional

Bank of Montreal

Finning Argentina and Finning Chile

Credit Suisse



ING (Tokyo branch), Sumitomo Mitsui Banking Corporation and MUFG Bank

Work highlights

  • Representing Cargill, ING Bank (Tokio branch), Sumitono Mitsui Banking Corp and MUFG Bank in the filing of proof of claims in the reorganisation of Vicentín.
  • Advising Avions de Transport Regional on the repossession of two airplanes in the reorganisation proceedings of Avian Líneas Aéreas.
  • Advised Credit Suisse throughout bankruptcy and liquidation of Banco General De Negocios, in which Credit Suisse has 12% of the voting stock.

Argentina > Competition and antitrust Tier 1

Combining a strong antitrust investigation practice with a reputation for merger filings in Argentina, Marval O’Farrell Mairal handles a range of competition matters across Latin America particularly Argentina, Brazil, Chile, Bolivia, Peru and Uruguay. The team assists companies dealing with economic regulations, as well as providing internal compliance advice to a broad spectrum of clients. Competition specialist Miguel Del Pino leads the team and can call on the experienced Santiago del Rio, who also focuses on the competition space, including merger control fillings. Another key name in the area is associate Ignacio Mora, who specialises in competition law and has expertise in Argentina and abroad.

Practice head(s):

Miguel del Pino


‘What I highlight about the team is the speed and quality of the answers they give. They get to know the business internally, and that helps ensure that the answers to our queries are always accurate (avoiding cross-examination). All the lawyers who give us support know the issues of their expertise in a remarkable way.

‘I could say exactly the same, however, I highlight the level of knowledge, commitment and response of Santiago Del Rio.

Key clients


Thermo Fisher



Corporación Mabe



General Motors

Coca-Cola FEMSA


Sumitomo Chemical

American Tower Corporation

Lone Star

Yara Corporation

Compagnie Gervais Danone

Delivery Hero

Siemens Healthineers


Helios Health (Fresenius)

Work highlights

  • Providing counsel to CCU on its landmark abuse of dominance case against Quilmes.
  • Advising Peugeot on the Argentine aspects of its 50/50 merger with Fiat.
  • Providing counsel to new client Thermo Fisher Scientific on its acquisition of PPD Incorporated.

Argentina > Compliance Tier 1

Marval O’Farrell Mairal‘s highly-specialised, full-time compliance department offers a broad range of compliance services with deep expertise in complex investigations, litigation and anti-corruption matters. The practice has extensive experience in complex cross-border cases, involving lawyers and forensic experts in multiple jurisdictions, and also handles day-to-day compliance work. Clients value the team’s ‘good mix of academic depth and practical experience’ and single out ‘extraordinary’ practice head Gustavo Morales Oliver for his ‘incomparable’ compliance knowledge.  The ‘impressiveMaría Lorena Schiariti, who has deep experience of public and administrative law, is another key figure. Pedro Serrano Espelta  has left the firm.

Practice head(s):

Gustavo Morales Oliver


‘The practice is efficient and very experienced in compliance and white collar criminal matters.

‘A good mix of academic depth and practical experience.

‘A high level of specialist expertise and a team that is always available.

‘Lorena Schiariti stands out. Her level of specialisation is impressive.

‘The extraordinary Gustavo Morales sets the compliance benchmark in Latin America.

‘The Marval team led by Gustavo Morales Oliver is sophisticated and has incomparable experience. They know the client’s industries and the main points of compliance concern in the area of compliance. They are clear and confident… leaders in their field. I do not know of another firm with their experience.

‘Gustavo Morales Oliver is an icon in the area of compliance in Argentina and has extensive international experience in internal investigations and negotiating agreements with authorities. He is a leader in the field.

Key clients


Amazon Web Services


Brown Rudnick



Instituto Massone

Newmont Corporation



Globant Ventures




Lilac Solutions

Nishimura & Asahi

Atis Group

Infrastructure Solutions


Work highlights

  • Advised Skanska on legal proceedings related to allegations of corruption in the construction of gas pipelines.
  • Assisting YPF in assessing specific compliance-related risks and the impact on its compliance program.
  • Assisted Brown Rudnick with assessing specific compliance-related risks and regulations involved in the potential hiring of former public officials by undisclosed clients.

Argentina > Consumer law Tier 1

Known for large, complex claims and class actions, Marval O’Farrell Mairal advises clients across industries on the preparation for new product launches in Argentina in compliance with local regulations. Key areas of work include outlining compliant corrective-action strategies, providing advice on labelling requirements and assistance with adapting products, services and sales plans. As well as the group's experience in consumer liability claims, the firm also fields a strong and sizeable tobacco product liability practice. Leandro M Castelli specialises in product liability claims, with a background in complex litigation. He co-leads the team with Fernando Montes De Oca, who focuses on litigation in the automotive industry; and Facundo Viel Temperley, whose fortes are procedural law and civil, commercial, consumer and product liability cases - he also has particular expertise in class actions. Key support is provided by associate Alejo Gascón.

Practice head(s):

Leandro Castelli; Fernando Montes de Oca; Facundo Viel Temperley


‘They are extremely well prepared under the technical standpoint.

‘Easy to work with, ability to work with internacional counsels and to thing the issues strategically.

Key clients

Massalín Particulares

Peugeot Citroën Argentina (Grupo Stellantis)

Philip Morris International

The Walt Disney Company Argentina

General Motors

Banco Santander Rio

Hermès Argentina

Magneti Marelli Cofap

Apple Argentina

BNP Paribas

Lojas Renner

Banco Itaú

Círculo de Inversores (de Ahorro para Fines Determinados)

Globers (Globant)

Book Depository ( Inc)

Work highlights

  • Representing in mediation, administrative and judicial proceedings initiated by users of the website who made different hotel reservations through it.
  • Providing strategic advice and complete regulatory compliance assistance for the launch and operation of the Disney+ and Star+ platforms.
  • Representing Credit Suisse, as defendant, in a class action related to the world-famous Madoff fraud.

Argentina > Corporate and M&A Tier 1

Domestic and international clients seek out the ‘proactive and knowledgeableMarval O’Farrell Mairal corporate and M&A team for ‘clear and precise’ advice on large and sophisticated M&A deals. The practice continues to handle a high volume of deals across multiple sectors, despite the wider slowdown in Argentine activity, and is the go-to firm for complex, cross-border deals as well as private equity-backed transactions. The firm has also expanded its regional practice and is retained by multinationals to coordinate transactions across Latin America, in the same way that US firms have done in the region, historically. The highly regarded Pablo Artagaveytia and Pablo Viñals Blake co-head the practice, which boasts a deep roster of of senior talent and experience. The iconic Héctor Mairal continues to provide critical strategic advice when called upon, with ‘outstanding’ M&A rainmaker and firm chairman Santiago Carregal another senior name. Additional senior practitioners include veteran transactional practitioner Pablo Garcia Morillo, who can draw on over two decades' partner-level experience; and the ‘highly analytical, empathic and committedDiego Krischcautzky who has extensive M&A, private equity and venture capital experience. Barbara V Ramperti, whose practice centres on M&A (particularly the acquisition of new business lines), joint ventures and reorganisations; and Diego Chighizola, a recognised player in the local cross-border M&A market (who also specialises in agribusiness and real estate), are both increasingly established players with a decade's partner-level experience apiece; while a pool of up-and-coming younger partners – including María Macarena García Mirri and María Laura Bolatti Cristofaro – provide further high-level support. At associate level, senior María Virginia Canzonieri (commercial and corporate law and M&A), is the key figure.

Practice head(s):

Pablo Artagaveytia; Pablo Viñals Blake


‘Diego Krischcautzky is an excellent professional. He has solid legal knowledge and extensive practical experience and is highly analytical, empathic and committed to the client.

‘The whole team is extremely attentive and very clear and precise.

‘Whenever we need some specific clarification on legal matters, we have full access to the main associates and partners, which makes all the difference.

‘The team displays creativity and finds ways to get deals done.

‘All of the attorneys I have worked with are proactive and knowledgeable.

‘Pablo Artagaveitya is always friendly and available. I have spoken with a lawyer on the team who did not know the issues.

‘They communicate and comment immediately on legislative and regulatory developments that occur in the areas of my interest.

‘A responsive team with great technical expertise and client service. Santiago Carregal is outstanding.

Key clients



Aerolíneas Argentinas

American Tower

General Atlantic


Riverwood Capital

Sumitomo Chemical Company

Newmont Goldcorp


Alacer Gold


Edmond M Safra






Turner – Time Warner


Takeda Pharma

Banco de Valores and Grupo Financiero




Compañía General de Combustibles

Diagnóstico Maipú

Stonepeak Infrastructure Partners

Mobile Marketing Services

Eternal Tsingshan Group



Marsh McLennan Companies



VF Corporation

NEC Corporation

Volvo Trucks & Buses


Zimmer Biomet


Work highlights

  • Advised Stonepeak Infrastructure Partners and AustralianSuper on the acquisition of the Latin American business of Lumen Technologies.
  • Advising Merck Sharp & Dohme Argentina on the cross-border reorganisation of its business.
  • Represented Navent Group in the sale of its online real estate technology platform business to QuintoAndar.

Argentina > Dispute resolution Tier 1

The ‘excellent’ team of ‘capable lawyers’ that make up Marval O’Farrell Mairal's dispute resolution practice are praised for their ‘detailed experience and knowledge’ and ‘wide network’. The practice is a consistent presence in the biggest and most complex disputes in Argentina and has a stellar track record handling all types of litigation as well as local and international arbitration work. The firm litigates before all levels of Argentina’s courts and acts as counsel in commercial and investor-state arbitrations. Constitutional and administrative matters, as well as bankruptcy litigation, are also covered. Ricardo Ostrower, who is singled out for his ‘exhaustive legal analysis’ and ‘vast experience in litigation’, leads a deep bench of talent. The ‘extraordinaryJulio César Rivera (h) focuses on commercial litigation, international and domestic commercial arbitration, insolvency and constitutional law; while Martín Campbell has expertise in commercial, business and labour law litigation. Santiago Soria has a strong energy and natural resources disputes practice, with civil and commercial litigation expert Rodrgio García and Elias Bestani -who has expertise in insurance, reinsurance, aviation and maritime disputes- also noted. The ‘extremely diligent’ litigation ‘guruFacundo Viel Temperley, who has a strong consumer practice, is also singled out by clients. The senior bench was further reinforced with the August-2022 appointment of arbitration and litigation practitioner Fernando M Alemany to the partnership; Martín Vainstein moved to Cleary Gottlieb Steen & Hamilton as an international associate the same month.

Practice head(s):

Ricardo Ostrower


‘The best law firm in Argentina for arbitration matters. The team of partners and associates is excellent.

‘Ricardo Ostrower is simply excellent. A true team leader and one of the smartest lawyers I have ever worked with anywhere in the world. Julio Rivera Jr is an extraordinary lawyer who is extremely attentive to his clients. Julio has proven to be one of the stars of arbitration in Latin America.

‘We hired Marval to handle a complex dispute with a third party in Argentina. Ricardo Ostrower’s exhaustive legal analysis of the case, his deep knowledge of the law and his vast experience in litigation were key factors in positioning us robustly in the dispute.

‘The complexity of the work carried out by Ricardo Ostrower and his team has been very high. The service provided is outstanding.

‘Ricardo Ostrower is without a doubt the best trial lawyer in Argentina and Latin America. He defines the standard of professionalism and excellence in his area of practice.

‘Guillermo Pefaur is a highly professional and detail-oriented attorney.

‘A team of capable lawyers with a broad breadth of knowledge and expertise. Detailed experience and knowledge of the judicial system and a wide network.

‘Facundo Viel Temperley has immense gravitas and is a guru of litigation and associated legal procedure. Extremely diligent and a stickler for detail. Always up for the fight but cognisant of the commercial position.

Key clients



General Electric

Barclays Bank

Credit Suisse



Pan American Energy




Work highlights

  • Representing Credit Suisse, as defendant, in a class action related to the world-famous Madoff fraud, involving the potential liability of Credit Suisse for negligence in its advisory services to its clients.
  • Representing INC in a litigation related to the debt restructuring proceedings of real estate developer Rivera Desarrollos.
  • Representing ATR in the repossession of two aircraft sold to Avian Lineas Aereas with retention of title.

Energy and natural resources > Mining Tier 1

Handling all issues related to mining projects and mining operations, Marval O’Farrell Mairal  has ‘proven that it is able to advise on different aspects of complex cross-border transaction because of its wide offering of legal services’. The practice’s strengths include large mineral-resources deals, complex regulatory matters and niche mining-related litigation. The team is also experienced in day-to-day advice on mining projects and operations in Argentina, from acquisition, exploration and feasibility, to construction and operation. Another feature of the practice is its advice to the Argentine mining chamber (Cámara Argentina de Empresarios Mineros). Following the retirement of veteran practitioner and former departmental head Luis E Lucero , practice leadership has passed to Leonardo Rodríguez a deeply experienced mining specialist with some 20 years’ dedication to the sector. He is flanked by an experienced line of associates including: seniors Ignacio Alonso (who recently assisted Glencore, Newmont and Yamana subsidiary, Minera Alumbrera, with complex litigation and regulatory matters); and Andrés Villarreal (whose recent matters include advising Anglogold Ashanti on exploration and option agreements with Latin Metals, regarding gold projects Organullo, Ana María y Trigal); along with recently appointed senior Agustina Dellacasa, whose practice centres on mining, natural resources and climate change, and associate María Mercedes Rudolph, who has a decade’s experience working throughout the mining sector.

Practice head(s):

Luis Lucero


‘Very responsive and knowledgeable team.’

‘Marval O’Farrell Mairal has proven that it is able to advise on different aspects of complex cross-border transaction because of its wide offering of legal services. This is very important to foreign clients as they are always looking for a law firm which can advise them on A to Z legal issues in Argentina.’

‘Leonardo Rodriguez and Maria Macarena Garcia Mirri are outstanding lawyers who are always available for their clients. Leonardo is very committed in ensuring that his clients get timely advice and is reachable even late at night. Maria is very knowledgeable and could pre-empt legal issues. They have proven to be valuable team members whom you want to have on your side when you have a cross-border M&A deal.’

Key clients


AngloGold Ashanti

Newmont Goldcorp

Pan American Silver

Hochschild Mining Corporation


Anglo American

Eternal Tsingshan Group Limited

Cámara Argentina de Empresarios Mineros

Lilac Solutions

Nova Royalty

Metalla Royalty & Streaming

Yamana Gold

Work highlights

  • Advised both Glencore and Newmont on the implementation of the integration between the Bajo de la Alumbrera copper-gold-molybdenum operation and the Agua Rica project – both located in Catamarca province, in the North-Western region of Argentina.
  • Advising joint venture MARA’s subsidiary on a number of regulatory issues related to the Alumbrera/Agua Rica project; and wholly-owned subsidiary Estelar Resources in connection with its Cerro Moro operation in Santa Cruz province.
  • Advised Eternal Tsingshan Group on the construction of its lithium plant in Argentina through an agreement with the Chinese steel group Tsingshan.

Argentina > Environment Tier 1

Marval O’Farrell Mairal’s environmental practice ‘stands out for its high professional level and in the quality of its work, legal analysis, neatness, punctuality and availability’. The compact team nevertheless handles the spectrum of environmental matters, from regulatory issues and litigation, to due diligence and M&A transactions - with a particular specialism in handling the environmental aspects of infrastructure, manufacturing, oil-and-gas, and conventional and renewable energy projects. Another strength is litigation, including criminal cases related to environmental pollution and infractions. Leading the team is Francisco MacÍas, whose expertise includes environmental claims, particularly in the energy and natural resources sector. At associate level, experienced seniors Gabriel Fortuna (who is active in environment matters relating to the mining, food, energy, manufacturing and oil and gas sectors); and Jimena Montoya (whose practice centres on environmental regulatory matters, audits and due diligence), are also key names.

Practice head(s):

Francisco Macías


‘The MOM team in environmental matters stands out for its high professional level and in the quality of its work, legal analysis, neatness, punctuality and availability. They are always friendly and maintain very good interpersonal. They adapt to new technologies with ease, and are always willing to collaborate. As for billing, it can be said that it is a rather onerous resource. Clearly the firm stands out favorably compared to other professionals in the field.

‘We work mainly with Gabriel Fortuna and Alejandra Cortiñas. They stand out for their high professional level and in the quality of their work and legal analysis; their neatness, punctuality, availability and kindness.

Key clients

Volkswagen Argentina

Grupo PSA (Peugeot Citroën)

Tuboscope (National Oilwell Varco)

Raízen Argentina

Danone Argentina


Cargill SACI

Compañía General de Combustibles

Compañía Mega


Pachon (Xstrata)

Copetro (Oxbow)

Petro AP

TGS (Nopec) _ Spectrum

Summit Agro Argentina

Work highlights

  • Advising Volkswagen in connection with the environmental proceedings related to the so called ‘diesel gate’ scandal.
  • Advising Compañía Mega on a class action and three claims for damages filed against several companies seeking remediation of environmental damages caused by the disposal of liquid effluents.
  • Advising Oxbow Carbon in connection with several environmental collective actions filed by citizens from the Ensenada and Berisso districts seeking a reduction of air pollution and compensation for damages supposedly caused by a petcoke plant.

Argentina > Insurance Tier 1

Held in high regard for its ‘excellent multidisciplinary team that gives constant support to all types of queries’, Marval O’Farrell Mairal is a stand out firm in the sector, with sources noting itsinsurance practice is sophisticated, with highly skilled individuals in the area who know the London insurance market and its nuances’. The practice work across the spectrum of insurance and reinsurance matters, advising insurance and reinsurance clients on general corporate matters. Core strengths for the team include regulatory advice and administrative proceedings, reinsurance claims, M&A, marine and aviation insurance, and product liability matters. The group particularly excels in the defence of collective and class actions against insurance companies, as well as other types of mass litigation in the insurance space. The 13-strong team is led by go-to insurance expert Pablo Cereijido  who can draw on some 25 years’ experience and focuses on complex matters. Senior support comes from fellow partner Elias Bestani  , who has over 20 years’ experience handling claims, coverage disputes and shipping and admiralty cases; and key associate María Victoria Rodríguez Mamberti , who focuses on marine and aviation matters. The group can also call on of counsel Alberto C Cappagli , who has a 40 year trajectory in the sector.

Practice head(s):

Pablo Cereijido


‘The team is oriented to meet the needs of the client and understand the business perfectly. The advice involves both the legal aspects and its economic impact and in the decision making from the business point of view, which makes it different from traditional legal advice. Customer follow-up is very good, as updates on topics that were consulted as those that could affect our business are always communicated in a timely manner.

‘Elias Bestani has been advising our company for a long time. He is a very capable professional, technically very solid, empathetic and above all assumes different roles to address issues, he is not limited to satisfying legal needs but on the contrary helps decision making from various aspects of the business, helping to obtain more information and decision tools.

‘The Firm has a solid technical response capacity, it is involved in the reality of the client’s business, allowing very satisfactory results.

‘The Partner Pablo Cereijido as well as the associates, among whom is Matias Acrogliano, are accessible lawyers and always aware of the needs of the client, which, added to their excellent technical training they have, constitutes a great tranquility for those who hire them.

‘An excellent multidisciplinary team that gives constant support to all types of queries.

‘Pablo Cereijido is the No1 on the market. No one knows more than he does about insurance and reinsurance.

‘Best lawyers in Argentina in my opinion – detailed, commercial and responsive, know the law.

‘The insurance practice is sophisticated, with highly skilled individuals in the area who know the London insurance market and its nuances, as well as how to handle that market in the context of complex aviation insurance matters in Argentina.

Key clients

XL Catlin

Allianz (UK)

The Zurich Group (including its JV with Banco Santander)


Marsh – Guy Carpenter & Company

Sura – Aseguradora de Créditos y Garantías

Assurant Argentina Compañía de Seguros – Virginia Surety


IRB Brasil Re


Generali UK

Hanseatica Compañía de Seguros

BNP Cardif

Peugeot Citroën insurer and insurance broking companies

Universal Assistance

Work highlights

  • Assisting Zurich Group and Mapfre in defending collective claims brought by consumer associations seeking reimbursement of premiums accrued during the Covid-19 outbreak.
  • Advising international reinsurer XL Catlin on a high-profile insurance and reinsurance claim concerning the collision of two helicopters during the filming of a French TV show that caused the death of all 10 Argentine and foreign citizens onboard the aircraft and the total loss of both helicopters.
  • Representing international reinsurer Royal & Sun Alliance in a complex judicial coverage dispute brought against it by Sancor (insurer) and Punto Sur (Sancor’s local reinsurer).

Argentina > Intellectual property Tier 1

Arguably the stand out firm for IP matters, be they transactional, contentious or tax related, it is worth recalling that full service market leader Marval O’Farrell Mairal began life as an IP boutique. It's ‘lawyers are very knowledgeable about IP issues and so are its patent technicians. They are a pleasure to work with, they are accurate, clear, timely and extremely reliable’. The sizeable practice -over 40-lawyers strong- is equally capable across all facets of IP practice, from local patent, trade mark and copyright litigation and enforcement, to handling IP prosecution and portfolio management for clients across Latin America and the Caribbean. Patent applications and trade mark prosecution are key areas of work for the team, which is further supported by the multidisciplinary expertise of the wider firm, including criminal law experts. Another distinguishing factor is its Enforcement Unit, focused on combating the damages arising from counterfeiting activities. The deep senior bench includes Iris Quadrio, who has experience advising domestic and foreign clients across the IP area; trade mark expert Sergio Ellmann; Martín Bensadon, who specialises in patents, particularly litigation and patent filing strategies in Argentina and other Latin American countries; and Gustavo Giay, whose focus is IP litigation, anti-counterfeiting and trade mark litigation. A phalanx of talented intermediate and younger partners includes Ignacio Sánchez Echagüe (patents); IP litigator Martín G Chajchir; Juan M López Mañan (trade marks and domain names); Cristian D Bittel (patent prosecution – particularly for pharma, biotech and agribusiness clients); and Diego Fernández (IP transactional matters and IT and privacy related advisory), along with Andrés O’Farrell (criminal litigation, enforcement and anti-counterfeiting) and Eugenio Hoss (patents), who were raised to the partnership in July 2021 and August 2022, respectively. Associate Manuela Adrogue, who specialises in information technology, data protection, privacy, IP asset transactions and brand protection, is also noted.

Practice head(s):

Iris Quadrio; Sergio Ellmann; Juan López Mañán; Martín Bensadon; Ignacio Sánchez Echagüe; Cristian Bittel; Gustavo Giay; Martín Chajchir; Diego Fernández; Andres O’Farrell


‘Marval full service commercial law firm with leading edge expertise in its fields. It has a big IP team meaning that there is always a person available to help. In addition, partners at the firm are easy to approach and get hold of.

‘Martin Chajchir is my main point of contact. He has an excellent team that supports him. Martin has a strong business sense. He easily grasps the facts that are relevant for the matter and he is excellent in qualifying them in legal terms. He also keeps an eye on practical and/or commercial solutions of disputes’

‘They have excellent customers all over the world. They also have as clients large Argentine companies and manage their work around the world. They are sought after to make a hub for Latam. Communication is very fluid, they use all available means including Whatsapp when necessary to speed up the processes and clarify doubts very quickly.

‘Lawyers are very knowledgeable about IP issues and so are patent technicians. They are a pleasure to work with, they are accurate, clear, timely and extremely reliable.

‘Cristian Bittel stands out in patents, he is an excellent patent technician who also dominates legal issues given his extensive experience. Juan López Mañan is the partner in the area of brands with whom we have the most cases. He likes to delve into each advice he gives to each client, evaluates all options and always seeks to achieve the greatest and best possible protection of the assets that are delivered to his charge.

‘Good strategy and excellent customer service.

‘Juan Marval is very good at helping with international strategy.

Key clients

Gilead Pharmasset

Millennium Pharmaceuticals

Eli Lilly and Company





The Coca-Cola Company (in Argentina and the Caribbean)



Imagen Satelital (member of the Turner group) / FSLA Holdings (member of the FOX group)

Work highlights

  • Representing Gilead Pharmasset in a highy significant patent infringement case in Argentina, relating to the enforcement of a patent covering a product for the treatment of Hepatitis C against multiple local generic companies.
  • Assisting Millennium Pharmaceutical in a patent infringement and damages action against Tuteur, a case involving unprecedented legal issues such as whether federal courts may hear an antitrust case brought as a counterclaim in a patent infringement suit, and how damages are calculated in patent cases.
  • Representing Eli Lilly in a case brought by and against Biosidus which involves several unprecedented legal issues, such as whether the reversal of a preliminary injunction automatically allows the defendant to claim damages and how biological inventions should be claimed and interpreted.

Argentina > International trade and customs Tier 1

With ‘deep knowledge of the legal aspects, added to an excellent proactivity’, Marval O’Farrell Mairal is able to ‘propose solutions and creative paths of action to carry out extremely complex matters’. Particularly active in high profile anti-dumping matters, the firm also handles a diversity of issues related to international trade remedies, customs law, tariff code classification and interpretation, rules of origin, and litigation in summary proceedings and tax assessments. Another key area of work for the practice is advising on import restrictions and export regulations related to managed trade policy and foreign exchange controls implemented by the Argentine government. Pablo Gayol is well regarded for his ‘solid background in anti-dumping rules’, and he co-leads with customs specialist Juan Pablo Rothschild. The deep senior bench also includes Patricia López Aufranc, who is similarly at the forefront of antidumping law. At associate level, Jazmine Daruich (a ‘very hard working professional’) who has broad international trade expertise, and customs specialist Juan Martin Sanz, are both noted.

Practice head(s):

Pablo Gayol; Juan Pablo Rothschild


‘Deep knowledge of the legal aspects, added to an excellent proactivity to propose solutions and creative paths of action to carry out extremely complex matters.’

‘Juan Martin Sanz and Juan Pablo Rothschild have shown us to be a solid team that accompanied our needs, providing clear answers and especially clearly defining levels of risks and opportunities in each case presented.’

‘Juan Pablo Rothschild and Juan Martin Sanz are two excellent professionals. Always very well predisposed and offering valuable alternatives for the business.’

‘They have excellent professionals that understand deeply antidumping rules in Argentina. Technical work is great.’

‘Pablo Gayol is very clever and has a solid background in anti-dumping rules. He always anticipates actions to be taken by the authorities. Jazmine Daruich is a very hard working professional. Draft and letters prepared by them are perfect.’

‘This practice is unique since they are able to blend theory and practice. When you have an issue and require an opinion, the explanation flows in both directions, the theoretical and legal background along with its practical implications for business.’

‘Juan Pablo Rotschield he is always attentive to our need and provides a quick response which are always thorough and business oriented.’

‘The practice of International Trade and Customs in a country highly regulated by both BCRA and Treasury authorities is of the utmost importance for companies to be able to count on first-class advice such as that provided by Marval O’Farrell Mairal.’

Key clients


Nike Argentina

Garmin International

Compañía Mega


PPC Santana

Electroporcelana Gamma

Grupo Roca

Globenet Cabos Submarinos

Klipsch Group

Work highlights

  • Representing PPC Santana (Brasil) in the Antidumping Sunset Review on Brazilian insulators.
  • Representing Electroporcelana Gamma S.A (Colombia) in the Antidumping Sunset Review on Colombian insulators.
  • Advising and representing Volkswagen in administrative proceedings before local regulatory authorities regarding the investigation of gas emissions of diesel cars, which is linked to investigations underway in the US, Europe, Latin America and other countries (such as Australia and Israel).

Argentina > Labour and employment Tier 1

Firm managing partner and one of Argentina’s most experienced labour litigation lawyers Javier Patrón heads the ‘first-classMarval O’Farrell Mairal labour and employment practice, which stands out for the ‘outstanding quality’ of its team. The practice is known for handling complex, sensitive and strategic matters and is regularly sought out by international clients seeking advice ranging from paying salaries in a foreign currency, to scaling back their Argentine workforces. The team is also adept in high profile labour litigation, where it supports domestic and foreign clients before all levels of courts, and has launched a new software platform that predicts the outcome of labour lawsuits, supporting the construction of defences for clients. Non-contentious matters are also a staple for the team, which advises on the labour aspects of transactions as well as labour compliance matters, immigration and union negotiations. Key names in the team include the ‘terrificEnrique Stile, who clients note for his ‘calm and wise manner’; Diego Kelly, who has advised on the highly topical introduction of US dollar payments in Argentina; experienced international labour and M&A expert Rodrigo Sola Torino and labour litigation veteran José María Llano.

Practice head(s):

Javier Patrón


‘Marval is at the top of our list of referrals to Argentina and, indeed, to anywhere in Latin America. They are by far the best labour and employment department we have worked with in their region. They are a first-class firm with very talented attorneys.

‘Enrique Stile has a very practical approach that puts clients at ease. He has a calm and wise manner in addressing a client’s issues. He is terrific!

‘They are very professional. They have experience and provide clear and immediate answers. The team provides immediate news on labour regulations and keeps the client informed.

‘Guillermo Osorio is experienced and clear in his advice.

‘Expert and in-depth knowledge of complex labour issues.

‘The outstanding quality of the firm’s partners and seniors, and their ability to provide high-quality advice on matters that require a cross-functional approach, stand out.

Key clients


Delivery Hero




Sea Group

Moët Hennessy • Louis Vuitton




British Airways


Aerolíneas Argentinas





United States of America


Work highlights

  • Advising GBT II Argentina (formerly American Express Global Business Travel) on reducing its local workforce by approximately 20%.
  • Assisted Nike in closing stores in Argentina in a situation where dismissals were restricted.
  • Assisting Sea Group in establishing its Shopee branch business in Argentina, including advising on the hiring process, union issues, employment regulations and immigration alternatives.

Argentina > Life sciences and healthcare Tier 1

Combining the resources of a full-service firm with ‘a very deep knowledge about the industryMarval O’Farrell Mairal’s life sciences practice ‘is a very well-disposed team with technical knowledge and the advantage of being part of a firm that covers all areas of law, which allows clients to receive quality analysis’. The department specialises in large transactions for industry clients, notably those in the pharmaceuticals, food and biotech sectors. Regulatory and contentious advice are also strengths of the team, including patent prosecution and enforcement work. Team leader Martín Mosteirin  has ‘great experience in life science matters’ and ‘stands out for his extensive knowledge about the pharmaceutical industry which is a very important plus for customers’. He is ably supported by young associate Carolina Andrea Ramirez  , who focuses on the life sciences and healthcare areas. Former fellow associate Camila Leone left the firm in May 2021.

Practice head(s):

Martín Mosteirin


‘The knowledge demonstrated by Martin Mosteirin is a complete differential.

‘It is a very well-disposed team with technical knowledge and the advantage of being part of a firm that covers all areas of law, which allows clients to receive quality analysis.

‘Martín Mosteirin stands out for his extensive knowledge about the pharmaceutical industry which is a very important plus for customers. The knowledge of the particularities, regulations of the industry and the actors, makes the resolution of the issues raised much more agile. It is also very useful to know common practices.

‘Marval is one of the best law firms in Argentina. Very experienced lawyers with Strong knowledge on their areas of expertise.

‘Martin Monsterin has great experience in life science matters.

‘I think Marval’s life sciences team is fantastic! they have a very effective and efficient provision of services, always available to solve any problem with a deep knowledge of the corresponding issues and a very simple way to explain issues that are normally very complex, especially coming from a jurisdiction other than Argentina.

‘I must talk about Martin Mosteirin, there is no better person to deal with the issues of this area. He is very friendly, always available with an answer to any questions you have and with a simple proposal to confront the problems, it is a delight to work with him and his team.

‘Marval has two very strong points: (i) they have a very deep knowledge about the industry, demonstrated over many years advising the main multinational companies in the pharmaceutical industry; (ii) they have a fairly large team of lawyers (5 or 6) which is an important comparative advantage over the rest of the firms. The partner that leads, Martín Mosteirin, must be the most relevant pharma lawyer in the industry.

Argentina > Public law Tier 1

The ‘technically excellent’ and ‘strategically mindedMarval O’Farrell Mairal public law practice offers highly valued support to domestic and international clients that compares to ‘the highest international standards’. The dedicated practice group is one of the largest in Argentina and plays a key in role in public-private partnerships (PPP) and big ticket infrastructure projects. The team has helped a number of clients to secure and renew major government tenders and concessions, and its public procurement track record is equally formidable. Clients also seek the out the group's services when involved in complex, sensitive negotiations with regulatory authorities - a specialsim where it has secured multiple successes helping clients to agree government subsidies and large-scale supply agreements. Marval’s public law disputes work impresses too, with the firm advising on a wide range of disputes and litigation, including tariff annulments, Central Bank regulations and concession-contract disputes. Moreover, the team has built on this disputes expertise to become an influential regional player in investment disputes and international arbitration proceedings. Advising on public ethics and the public law aspects of M&A deals are other areas of strength. The practice is co-led by iconic firm founder Héctor Mairal; the ‘excellent’ María Lorena Schiariti, who ‘adds value to the decision-making environment’; and Enrique Veramendi, who ‘manages complex, multi-jurisdictional litigation cases with a perfect organisation’. The practice has further strengthened its talent pool with the August-2021 promotion of Gonzalo Santamaria to partner and the recruitment of four new associates, including the October-hire of rising star senior associate, Sofia Cimmarusti, from Allende & Brea.

Practice head(s):

Héctor Mairal; María Lorena Schiariti; Enrique Veramendi


A versatile team that pays attention to detail and is always focused on the needs of the client.

The public law team at Marval is technically excellent and strategically minded.

‘Lorena Schiariti is a solid professional and excellent ability to connect with clients. She understands issues from a legal and commercial perspective and adds value to the decision-making environment.

‘Marval offers quality services that compare to the highest international standards. The fees are high, but the service makes paying these sums justifiable.’

‘Enrique Valentin Veramendi is an excellent lawyer and a pleasure to work with.’

‘The technical knowledge of legal issues in public law stands out.’

‘The lawyers are business-minded when making recommendations.’

‘The practice has a deep knowledge of the Argentinian market, providing excellent legal advise with perfect English language capabilities. Able to build teams as needed by the client.’

Key clients

Deme Group

CCCC Shanghai Dredging Co

Autopistas del Sol

Mercado Libre


Grupo Concesionario del Oeste

GE Healthcare

MicroStrategy Group


Aerolíneas Argentinas




Pedidos Ya









Camargo Correa

Loma Negra – Ferrosur

Massalin Particulares

Red Hat

Antares Argentina

Work highlights

  • Ongoing strategic and day-to-day advice to Autopistas del Sol, the largest toll road concessionaire in the country, in connection with the implementation and enforcement of a renegotiation agreement reached in 2018, and a potentially imminent new dispute with the Argentine government.
  • Assisting Mercado Libre with challenging an Argentine Central Bank regulation requiring financial entities to record e-wallet deposits with the Central Bank.
  • Assisting Dredging International with challenging its initial disqualification from an Argentine Port Authority bidding process for acquisition of dredging services of the Paraná–Paraguay waterway.

Argentina > Tax Tier 1

Clients praise Marval O’Farrell Mairal‘s tax practice for its ‘remarkable analytical capacity’, ‘deep knowledge of the market’ and experience handling ‘complex’ and ‘sensitive’ matters. The team is co-led by partners María Inés Brandt, who provides high-level transactional and tax planning advice; corporate taxation expert Walter C Keiniger; the ‘highly regardedGabriel Gotlib and the ‘excellent’ M&A tax expert Fernando Vaquero. Veteran tax and customs lawyer Horacio García Prieto is another senior presence. A deep pool of talent at associate level, including international tax specialist Maria Paula Castelli, tax litigation lawyer Sergio Vergara and tax all-rounder Luciana Virgile enables the practice to provide a full-service tax offering to international and domestic clients. The team is a formidable presence in transactional tax matters, working closely with colleagues in the firm’s heavyweight corporate and M&A practice, but also displays an impressive track record in big-ticket tax litigation matters, tax planning and wealth management, among other areas.

Practice head(s):

María Inés Brandt; Gabriel Gotlib; Walter C Keiniger; Fernando Vaquero


‘Marval’s tax practice has a pragmatic, agile approach, and a remarkable analytical capacity. The team always works with a sense of urgency.

‘Fernando Vaquero demonstrates excellent analytical skills and a great ability to simplify the complex.

‘The team has deep knowledge of the market. The team deliver excellent availability and commitment to the client. In a legal market as complex as Argentina’s, they facilitate decision-making and accurately support our operation.

‘The team has experience in complex transactions, deep knowledge of the market and legal framework. They work thoroughly and know the client.

‘The tax team is always accessible and provides us with strong advice, delivering excellent results.

‘Angel Pereira and Fernando Vaquero have a unique outlook and their advice is always legally robust and practical at the same time.

‘Top-level advice on very sensitive tax issues in a country like Argentina, where uncertainty reigns.

‘Gabriel Gotlib is highly regarded as a great tax specialist and a specialist in complex problems.

Key clients


General Motors

Telecom Argentina

Banco Santander

Kimberly Clark


Tata Consultancy Services

Work highlights

  • Represented Navent Group on the closing of the sale of its online real estate technology platform business to QuintoAndar.
  • Advised WeWork on investment and joint venture agreements with the SoftBank Latin America Fund for WeWork’s operations in Argentina, Brazil, Chile, Colombia, and Mexico; the matter included the prior reorganisation of WeWork’s holding structure for operations in the region.
  • Represented Telmex Argentina in a proceeding initiated by the National Tax Authority challenging the existence of a loan received from a foreign related party.

Argentina > TMT Tier 1

The multidisciplinary TMT team at Marval O’Farrell Mairal provides ‘solid support, complemented by professionals from related areas so that the advice is comprehensive’. The firm brings together expertise in regulation, finance and litigation to advise across the TMT spectrum, including television, telecoms and online gaming. The dedicated IT practice group handles criminal and civil matters related to technology, from internet matters to privacy and cybersecurity. Blockchain and fintech are also key strengths, with the team advising on crypto-assets, virtual wallets, and cloud and blockchain transactions. The group is co-led by Daniel Di Paola, who focuses primarily on telecoms and broadcasting; Javier Etcheverry Boneo, who specialises in business law, particularly in the broadcasting, internet, media and telecom sectors; and IT and privacy expert Gustavo Giay. Also active in the area is Diego Fernández, whose expertise includes multijurisdictional data protection and privacy work. However, key senior associate Claudia Paluszkiewicz moved in house as regional legal head at in March 2022.

Practice head(s):

Daniel Di Paola; Javier Etcheverry Boneo; Gustavo Giay


‘Very solid support, complemented by professionals from related areas so that the advice is comprehensive.

‘Proactivity, being one step ahead, full time availability.

‘A team of highly trained professionals, who understand the needs of the business and willing to take risks.

‘Diego Fernández is an extraordinary professional, a benchmark in the field of data privacy, with a very close and friendly treatment.

‘Great knowledge and experiences in the area of data protection law in Argentina.

‘Diego Fernández knows a lot about the practices of foreign companies, their advice is always useful and practical for our clients (Japanese companies). His response is always timely and the fees are always transparent.

Key clients

The Walt Disney Company (Argentina) / Fox / ESPN


América Móvil / Claro Argentina

Globenet Cabos Submarinos



Photon Studios


Mercado Libre



Work highlights

  • Advice to Globenet Cabos Submarinos regarding the deployment of Globenet’s subsea cable system to Argentina (Project Malbec; connecting Rio de Janeiro, São Paulo and Buenos Aires) and the day-to-day operations of the local company.
  • Advice to Playtech on the submission of its offer in the bidding process launched by the Province of Buenos Aires to legalise online gambling and sports betting.
  • WarnerMedia and Discovery merged to become a new company that is now one of the largest US media businesses; the team provides regulatory and antitrust advice regarding the local impact of the operation.

Energy and natural resources > Electricity Tier 2

Known for its comprehensive approach, Marval O’Farrell Mairal advises along the full length of the electricity generation and supply chain, from public tenders for generation projects (thermal, cogeneration, hydroelectric, nuclear, renewable energy), to international and local PPAs. Core strengths for the team include regulatory matters and disputes work, with renewable and hydro-electric matters being a particular area of growth. Francisco Macías  heads the practice and specialises in international and local power transactions, contracts and regulatory matters. He can call on the expertise of newly promoted partner Gonzalo Santamaria , whose strengths include regulatory and contract issues in the power sector, as well as advising on thermal, hydroelectric and renewable energy projects. ‘Exceptional lawyerLuciano Ojea Quintana  rounds out the senior team.

Practice head(s):

Francisco Macías


‘A complete team, with specialists in all branches involved. It allows you to have answers and practical solutions and quickly.’

‘Gonzalo Santamaría is an extremely capable and very practical lawyer. He quickly understands the client’s concerns and based on that he builds his legal strategy. Great predisposition and always available to talk and provide answers.’

‘Luciano Ojea Quintana is an exceptional lawyer, who understands the business of his clients and, with total transparency, helps to find the best possible solutions.’

Key clients


General Electric (GE)

Gezhouba Group

Interconexión Eléctrica

Scatec Solar


Canadian Solar

Engie – Tractebel Energía


Seaboard Energías Renovables y Alimentos

Loma Negra






Sealed Air

MWh Solar

Algonquin Power


Work highlights

  • Advising China’s Gezhouba Group on regulatory power issues and contract negotiations related to the construction of two hydroelectric dams in the Province of Santa Cruz: Nestor Kirchner and Jorge Cepernic.
  • Provided regulatory and contractual advice to leading cement manufacturer Loma Negra, which operates ‘inside the fence’ power generation facilities; the Genneia/Loma Negra renewable PPA was the first such contract entered into between private parties.
  • Advised MWh Solar, which is the first self-generator to secure the fiscal benefits contained in Law No. 27,191, on regulatory and contractual matters regarding the project.

Energy and natural resources > Oil and gas Tier 2

Marval O’Farrell Mairal is recommended for combining ‘great knowledge and professional experience with an excellent understanding of the business and the needs of the client’. The firm provides ‘extensive experience in the energy sector, as well as a professional team with great experience and reputation, and a panel of relevant clients’. The core strengths of the practice include large transactions, oil and gas sector disputes and arbitration, regulatory and administrative matters the length of the hydrocarbons supply chain - from E&P to mid and downstream, and increasingly, decarbonization and green hydrogen projects. Moreover, the full-service firm can bring multidisciplinary expertise to the table, and demonstrates a particularly strong track record in the natural gas market. Oil-and-gas specialist Francisco Macías spearheads the practice and can call on the expertise of experienced associate Jimena Montoya, who focuses on oil, gas and environmental matters. The April-2022 departure of former practice co-head Ricardo Beller to join Miami-based PAG Law, was undoubtedly a loss, but the firm has moved with its characteristic speed to re-stock its partner-level bench with the hire of hydrocarbons specialist Soledad Riera, formerly head of legal (for liquids, telecommunications and new business) at Trasportadora de Gas del Sur; and the promotion of Agustina Ranieri, who in addition to her energy sector know-how has expertise in banking and finance matters – effective June and August 2022, respectively. The practice group also has recourse to 40-year veteran Arturo Pera, who formerly worked in house at Total and current vice-president of the Argentine Association of Energy Law and Mineral Resources.

Practice head(s):

Francisco Macías


‘The professionals of this firm successfully combine a great knowledge and professional experience with an excellent understanding of the business and the needs of the client. Francisco Macías is the main relationship partner who coordinates the involvement of many other partners and professionals of this firm accordingly in line with the specific services’ needs.’

‘This firm has extensive experience in the energy sector, as well as a professional team with great experience and reputation, and a panel of relevant clients. All this makes this firm offer a highly reliable and first class service.’

‘In particular we highlight the work of Francisco Macias and his team. Maria Macarena Garcia also stands out in that aspect. Of course, the experience, the professionalism, the technical level stand out on par with the legal level, which is so necessary in the energy industry.’

‘We have entrusted our affairs to Marval many years ago. They have demonstrated a great knowledge of the industry and a closeness that motivates us to place our trust in them. It highlights the speed with which they respond to our requests, the experience with which their partners and associates have and the patience they have in having to deal with our bureaucracies.’

Key clients

Exxon Mobil / Exxon

Royal Dutch Shell / Raízen Argentina

Compañía Mega (joint venture between YPF, Petrobrás and Dow)

Corporación América / Compañia General de Combustibles (CGC)


Engie (formerly, GDF Suez)

Total (including Total Austral, Total Gas y Electricidad SE and Total Gas Marketing)


Transportadora de Gas del Sur (TGS) / controlling company Compañía de Inversiones de Energía (CIESA)

Schlumberger Argentina

DLS Archer




Gasoducto Nor Andino

Gasoducto GasAndes

Litoral Gas

Tullow Oil plc


Searcher Seismic

TGS / Spectrum






High Luck Group / controlling company New Times Energy Corporation

Pan American Energy

Work highlights

  • Advising Compañía General de Combustibles (CGC) on the acquisition of Sinopec Argentina Exploration and Production, the fifth largest oil producer in the country.
  • Advising gas producers including Tecpetrol and CGC in connection with their participation in Plan Gas Ar, an incentive program launched by the federal Government to foster investment in the upstream sector.
  • Advising Tullow Oil, and the UT MLOs 114 and 119 that Tullow operates in a joint venture with Wintershall and Pluspetrol, in connection with oil & gas regulations, compliance with Secretary of Energy registration requirements, and general advice.

Argentina > Real estate Tier 2

Providing ‘a lot of knowledge of the real estate sector', Marval O’Farrell Mairal handles pure real estate transactions as well as real estate issues related to M&A deals. The team’s strength lies in purchase, sale and lease transactions, along with real estate development, construction and financing - particular specialisms being conservation projects in Argentina and AAA office buildings in downtown Buenos Aires. The real estate practice can also call on the firm's market-leading banking, corporate and tax departments when needed. Hernán Slemenson focuses on real estate financing, development, sale, purchase and leasing transactions, as well as restructuring. He co-leads the team with Diego A Chighizola, whose fortes are real estate development and financing.

Practice head(s):

Hernán Slemenson; Diego Chighizola


‘The most valuable thing about the team is that they have a lot of knowledge of the real estate sector, that greatly facilitates the relationship with the client since it is not necessary to explain the by less of the business.

‘What has surprised me the most is the quick responses I have been given to the issues on which we have worked together. It was not necessary to claim anything from them, but they quickly had everything ready.

Key clients

Hilton Hotels Corporation

InterContinental Hotel Group

Edmond Safra

Faena Group

The Guggenheim Nicklaus Partners Fund

Pegasus Real Estate Fund


Bank of America Merrill Lynch

JPMorgan Chase Bank

ABN Amro Bank (Argentina branch)

Nassef Sawiris (NNS)


Tompkins Conservation and Rewilding Argentina

The Butler Conservation Fund and The Wyss Foundation

Lojas Renner

Pernod Ricard (Argentina)

Citromax (Argentina)

Work highlights

  • Advising Edmond M Safra on commercial real estate projects in connection with the development and construction of AAA office buildings in downtown Buenos Aires.
  • Advise Tompkins Conservation and Rewilding Argentina on complex legal issues related to creating national and provincial parks in the largest privately-owned land holding for conservation purposes.
  • Advising The Butler Conservation Fund and The Wyss Foundation on conservation projects in Argentina; involving the terms of land acquisition and setting up protected areas under different regimes, with mandatory conservation obligations.

Founded in 1923, Marval O’Farrell Mairal is the largest law firm in Argentina. A market leader at both local and Latin American levels, the firm has been providing sophisticated, high quality advice to international and local clients for 90 years. The firm comprises over 300 lawyers and has wide experience of international business issues and the complexities of cross-border transactions.

Our unmatched strength allows us to react quickly and to simultaneously handle large, complex and time-consuming transactions without compromising on quality. All our teams are led directly by highly experienced partners and carefully tailored to meet the specific needs of our clients. We have a strong focus on high-end corporate and finance transactions and the largest, most active litigation and arbitration practice in Argentina.

Our leading intellectual property department provides a comprehensive service and has unrivalled experience; the firm was originally founded as an intellectual property office. We are also a market leader in a wide range of other key practice areas including tax, fintechlabor and employment, competition/antitrust, energy and natural resources, administrative and public law, insurance and reinsurance, telecommunications and broadcasting as well as real estate and construction.

We are the Argentine member of Lex Mundi, the world’s leading association of independent law firms, comprising more than 160 members. We also have an office in New York, providing invaluable support on US transactions. With a long history of advising multinational companies and international institutions, we have a unique understanding of the Argentine market and how to help our clients achieve their goals. Marval O’Farrell Mairal has a 90-year track record of being prepared to respond to any challenge, both in the country and in complex cross-border transactions.

Banking and finance Santiago Carregal
Banking and finance Gabriel Matarasso
Bankruptcy and restructuring Martín Campbell
Competition and antitrust Miguel del Pino
Compliance/ White-collar crime Gustavo Morales Oliver
Compliance/ White-collar crime Andrés O'Farrell
Consumer Law Leandro M. Castelli
Consumer Law Fernando M. Montes de Oca
Consumer Law Facundo Viel Temperley
Corporate and M&A Pablo Artagaveytia
Corporate and M&A Pablo Viñals Blake
Dispute resolution Ricardo A. Ostrower
Energy and natural resources: Electricity Gonzalo Santamaría
Energy and natural resources: Mining Luis Lucero
Energy and natural resources: Oil and Gas Francisco Macías
Energy and natural resources: Oil and Gas Ricardo W. Beller
Environment Francisco Macías
Insurance Pablo Cereijido
Insurance Elías Bestani
Intellectual property Iris V. Quadrio
Intellectual property Martín Bensadon
Intellectual property Sergio M. Ellmann
Intellectual property Juan M. López Mañán
Intellectual property Ignacio Sánchez Echagüe
Intellectual property Cristian D. Bittel
Intellectual property Gustavo P. Giay
Intellectual property Martín G. Chajchir
Intellectual property Diego Fernández
International trade and customs Pablo Gayol
International trade and customs Juan Pablo Rothschild
Labour and employment Javier E. Patrón
Life sciences and healthcare Martín J. Mosteirin
Public law Héctor Mairal
Public law M. Lorena Schiariti
Public law Enrique Veramendi
Real estate Hernán Slemenson
Real estate Diego A. Chighizola
Tax María Inés Brandt
Tax Gabriel Gotlib
Tax Walter Keiniger
Tax Fernando M. Vaquero
TMT Daniel Di Paola
TMT Gustavo P. Giay
TMT Javier Etcheverry Boneo
Fintech Juan M. Diehl Moreno
Life sciences and healthcare Martín J. Mosteirin
Francisco Abeal photoMr Francisco AbealPartner
Pablo A. Artagaveytia photo Pablo A. ArtagaveytiaPablo A. Artagaveytia has been a partner at Marval O’Farrell Mairal since…
Martín Bensadon photo Martín BensadonMartín Bensadon joined Marval O’Farrell Mairal in 1991 and has been a partner of…
Elias F. Bestani photo Elias F. BestaniElías F. Bestani specializes in shipping and maritime law, insurance and reinsurance…
Cristian D. Bittel photo Cristian D. BittelCristian Daniel Bittel joined Marval O’Farrell Mairal in 2004 and became a…
María Laura Bolatti Cristofaro photo María Laura Bolatti CristofaroPartner since 2021, María Laura Bolatti Cristofaro focuses her practice on corporate…
María Inés Brandt photo María Inés BrandtMaría Inés Brandt is a partner of Marval O’Farrell Mairal Tax Department…
Guillermo Burman photo Guillermo BurmanHis area of specialization is corporate and finance law. He gives legal…
Martín Campbell photo Martín CampbellMartin Campbell joined Marval O’Farrell Mairal as partner in 2000. Since August 2015…
Santiago Carregal photo Santiago CarregalSantiago Carregal is the Head of the Banking and Finance Department and…
Leandro M. Castelli photo Leandro M. CastelliLeandro M. Castelli joined Marval O’Farrell Mairal in 1994 and became a partner in…
Pablo S. Cereijido photo Pablo S. CereijidoPablo S. Cereijido joined Marval O’Farrell Mairal in 1993 and has been…
Martín G. Chajchir photo Martín G. ChajchirMartin Chajchir joined Marval O’Farrell Mairal in 2002 and became a partner in 2013.…
Diego A. Chighizola photo Diego A. ChighizolaDiego Chighizola joined Marval O’Farrell Mairal in 2001, and became a partner…
Jazmine Daruich photo Jazmine DaruichJazmine Daruich joined Marval O’Farrell Mairal in 2008 and is currently a…
Miguel Del Pino photo Miguel Del PinoHis area of specialization is centered on competition and mergers and acquisitions.…
Daniel Di Paola photo Daniel Di PaolaDaniel Francisco Di Paola joined Marval O’Farrell Mairal in 2000 and is…
Juan M. Diehl Moreno photo Juan M. Diehl MorenoHe is the head of the FinTech Department and partner in the…
Sergio M. Ellmann photo Sergio M. EllmannSergio Ellmann joined Marval O’Farrell Mairal in 1983 and has been a partner since…
Javier Etcheverry Boneo photo Javier Etcheverry BoneoJavier Etcheverry Boneo is a partner at Marval O’Farrell Mairal since 1996,…
Diego Fernández photo Diego FernándezDiego is a partner in the IP, IT & privacy practice group.…
Gonzalo J. Fontana photo Gonzalo J. FontanaGonzalo Fontana specializes in litigation and commercial and corporate law. Within this…
Gabriel A. Fortuna photo Gabriel A. FortunaGabriel Alejandro Fortuna joined Marval O’Farrell Mairal in 2005 and is currently…
María Macarena García Mirri photo María Macarena García MirriShe specializes in corporate and commercial law; M&A, joint ventures and corporate…
Pablo Garcia Morillo photo Pablo Garcia MorilloPablo García Morillo specializes in business and corporate law and his professional…
Horacio García Prieto photo Horacio García PrietoHe is an expert on tax and customs law and has advised…
Pablo Gayol photo Pablo GayolHis practice in the firm is centered in international trade, mergers and…
Gustavo P. Giay photo Gustavo P. GiayHe specializes in Intellectual Property litigation. His practice has focused on trademark…
Gabriel Gotlib photo Gabriel GotlibGabriel Gotlib specializes in tax, corporate and financial law. He has broad…
Sebastián M. Iribarne photo Sebastián M. IribarneSebastián M. Iribarne specializes in banking, finance and corporate law. His practice…
Walter C. Keiniger photo Walter C. KeinigerHis practice involves counseling local and foreign companies in the design, planning…
Diego S. Kelly photo Diego S. KellyDiego S. Kelly specializes in advising multinational and local companies in labor…
Diego Krischcautzky photo Diego KrischcautzkyHis practice is focused on commercial, corporate and insurance law. He has…
José María Llano photo José María LlanoHis practice has focused on Labor and Social Security Law and he…
Patricia López Aufranc photo Patricia López AufrancHer practice has focused on international financial and commercial transactions, mergers and…
Juan M. López Mañan photo Juan M. López MañanJuan M. López Mañán specialises in trademarks and domain names and has…
Luis E. Lucero photo Luis E. LuceroHe practices law in the fields of natural resources with a focus…
Francisco A Macias photo Francisco A MaciasFrancisco A. Macías specializes in oil & gas, power, public services, infrastructure,…
Cecilia M. Mairal photo Cecilia M. MairalShe has extensive experience and is highly active in advising banks in…
Héctor Mairal photo Héctor MairalAn expert in administrative and business law, he has been involved in…
Gabriel G. Matarasso photo Gabriel G. MatarassoHis areas of specialization include corporate, commercial, finance and capital markets, both…
Fernando M. Montes de Oca photo Fernando M. Montes de OcaHe is specialized in litigation and dispute resolution in the civil and…
Gustavo Morales Oliver photo Gustavo Morales OliverGustavo Morales Oliver leads the Compliance, Anti-Corruption & Investigations practice. He also…
Martín J. Mosteirin photo Martín J. MosteirinHe provides both contentious and non-contentious legal advice to leading global companies…
Andrés O'Farrell photo Andrés O'FarrellAndrés O’Farrell has become partner of Marval O’Farrell Mairal in 2021. He…
Luciano M. Ojea Quintana photo Luciano M. Ojea QuintanaHe specializes in banking, finance, and M&A. In the banking and finance…
Guillermo M. Osorio photo Guillermo M. OsorioHe is part of the team that specializes in high profile, complex…
Ricardo A. Ostrower photo Ricardo A. OstrowerRicardo A. Ostrower has been Head of the Litigation and Arbitration Department…
Javier E. Patrón photo Javier E. PatrónHe leads the employment litigation sector and specializes in providing legal support…
Arturo Pera photo Arturo PeraArturo Pera joined Marval O’Farrell Mairal in 2016 as Of Counsel in…
Iván A. Poli photo Iván A. PoliIván Poli specialises in IP law and advises foreign and domestic clients…
Iris V. Quadrio photo Iris V. QuadrioIris V. Quadrio specialises in IP law, with extensive experience advising domestic…
Barbara V. Ramperti photo Barbara V. RampertiBárbara Ramperti specializes in commercial and corporate law. She has advised clients…
Agustina Ranieri photo Agustina RanieriPartner
Julio César Rivera (h) photo Julio César Rivera (h)As a partner of the Litigation & Arbitration department, he specializes in…
Leonardo G. Rodriguez photo Leonardo G. RodriguezLeonardo G. Rodríguez is a mining specialist with more than 15 years’…
Juan Pablo Rothschild photo Juan Pablo RothschildHis area of expertise is Customs Law, Foreign Trade and Tax Law.…
Ignacio Sánchez Echagüe photo Ignacio Sánchez EchagüeHe specializes in industrial property and more particularly in patent law, having…
Gonzalo Santamaría photo Gonzalo SantamaríaPartner since 2021, Gonzalo’s areas of expertise are Administrative and Energy Law…
María Lorena Schiariti photo María Lorena SchiaritiA specialist in Administrative Law, she has intervened in matters of high…
Roberto Silva Jr photo Roberto Silva JrHe specializes in corporate, commercial and banking law. Within his area of…
Hernán Slemenson photo Hernán SlemensonHernan Slemenson has participated as legal advisor in a broad range of…
Rodrigo Sola Torino photo Rodrigo Sola TorinoRodrigo Solá Torino’s practice focuses on advising in labor & employment matters,…
Santiago Soria photo Santiago SoriaSantiago Soria has vast experience in complex commercial litigation, including disputes among…
Enrique M. Stile photo Enrique M. StileHe specializes in labor and employment law. His practice in the firm…
Sergio Tálamo photo Sergio TálamoPartner since 2021, Sergio specializes in capital markets and corporate finance. He…
Fernando M. Vaquero photo Fernando M. VaqueroSpecialises in taxation issues related to M&A, financing, business restructuring, real estate…
Enrique Veramendi photo Enrique VeramendiHe provides advice on public law, economic regulation and administrative contracts to…
Facundo Viel Temperley photo Facundo Viel TemperleyA member of the Litigation Department, he specializes in procedural law and…
Pablo Viñals Blake photo Pablo Viñals BlakePablo Viñals Blake leads the Private Equity, Venture Capital and Agribusiness Groups.…
Santiago del Rio photo Santiago del RioSantiago del Rio joined Marval O’Farrell Mairal in 2006 and is a…
Partners : 67
Total lawyers : 236
Total staff : 596

Diversity and Inclusion in our Firm

Founded in 1923, Marval O’Farrell Mairal is the largest law firm in Argentina, and a leader in the country and in Latin America.

For over ninety-five years we have provided sophisticated advice to national and international clients, with a strong focus on high-end corporate and financial transactions. We also have the largest, most active litigation and arbitration practice in Argentina and a first-rate Intellectual Property Department.

Our more than three hundred lawyers have extensive experience in deeply demanding and complex matters, led by greatly experienced partners whose focus is to meet our clients’ goals. This strength allows us to react quickly and, thus, participate simultaneously in large, complex, and sensitive transactions with high-quality service.

Our Priority

Diversity is at the top of our Firm’s agenda. We have created internal working groups to promote actions that reaffirm our deep commitment to providing all our employees with a diverse and inclusive work environment.

For an effective implementation of actions reflecting our culture and values, in 2016 we created the Diversity Committee which includes 13 partner members.

Our Mission

To foster a culture of diversity and inclusion by embracing different lifestyles and choices and, thus, increasing the value we provide to our clients, improving our organization’s reputation and making us more attractive to professional talent.

Our Main Purposes

  • Highlighting the value of having diverse human capital in today’s world.
  • Supporting the women in our firm to fulfil their professional goals.
  • Sensitizing the organization about cultural biases.
  • Progressively increasing the number of diverse professionals in leading positions
  • Consolidating Marval O’Farrell Mairal as one of the best law firms in Argentina for the professional development of diverse talent.
  • Fostering continued education so as to become more attractive every day to our professionals and our clients.
  • Progressively achieving more flexibility.

BUILDING an environment where everyone feels supported, respected, heard, and committed to doing their best.

REFLECTING our values in terms of acceptance, respect, and dialogue, where different lifestyles and choices are valued.

ENCOURAGING teams to be innovative and perform to their fullest potential so as to accelerate business progress.

Work Teams

Including five teams dedicated to different initiatives involving more than 50 members.

Gender: (Women’s team) including lawyers of different seniority and practice areas, for creating a venue for dialogue on gender diversity and the associated professional challenges and proposing initiatives that address them.

Between Generations: to put together activities to promote interaction between employees of different generations.

Persons with Disabilities: to create awareness of how individuals with disabilities are treated in our firm and in the larger society. Our goal is to implement optimal conditions to incorporate them to our firm.

LGBTIIQ+: to raise awareness about LGBTIIQ+ issues and promote respect and labor inclusion.

Sociocultural: to understand and share the experiences of our employees with ethnic, social, and cultural matters.

Find a detailed version at this link: