McDermott Will & Emery AARPI > Paris, France > Firm Profile

McDermott Will & Emery AARPI
75007 PARIS

France > Industry focus: Healthcare and life sciences Tier 1

The ‘undeniably competent‘ team at McDermott Will & Emery AARPI stands out for its M&A and licencing work, advising key pharmaceutical manufacturers on strategic matters. At the forefront of science, the team handled the acquisition of SK Holdings on behalf of Yposkesi, the first French pharmaceutical manufacturer dedicated to the production of gene and cell therapy drugs for rare diseases. The team is led by Emmanuelle Trombe  and Anthony Paronneau, who are known for their ‘great legal skills as well as for an incomparable knowledge of the life sciences sector.’

Other key lawyers:


‘An undeniable competence, a commitment beyond expectations, a permanent availability.’

‘This firm combines (i) high quality of legal advice, (ii) humility and (iii) sympathy in daily exchanges.’

‘The team offers a complete service offer for emerging biotechnology companies: assistance with fundraising, signing of partnerships, setting up of stock options… always with a responsive approach and accurately adapted to the needs of the client.’

‘A strong capacity to listen to the client, but also to the opposing party, allows us to bring a new perspective on the negotiations in progress and to improve our position. Anthony Paronneau’s competence and availability make him an ideal partner: the quality of his analyses and his level of commitment are exceptional.’

‘Multi-disciplinary and very international team. Capable of adapting to small life sciences clients, but also to large clients given their activity with these two types of players.’

‘Emmanuelle Trombe, Anthony Paronneau and their teams combine human qualities and great legal skills, as well as an incomparable knowledge of the life sciences sector.’

‘Very good personal and human connection. Friendly and attentive team.’

‘Emmanuelle Trombe is an excellent lawyer, with good business acumen, and always available.’

Key clients

Corlieve Therapeutics

Gamut Therapeutics




Pierre Fabre


AbolerIS Pharma


Kurma Partners

Advent France Biotechnology

Work highlights

  • Advised Yposkesi, the first French pharmaceutical manufacturer dedicated to the production of gene and cell therapy drugs for rare diseases, on its acquisition by SK Holding, a South-Korean investment conglomerate.
  • Acted as counsel for Gamut Therapeutics, a biotechnology company developing a unique gene-independent approach to treat advanced stages of rod and cone dystrophies, in relation to its merger with SparingVision.
  • Assisted therapeutic AI pioneers Diabeloop SA, a new client of the firm, with two transactions: a joint development agreement with Terumo Medical Corporation; and a partnership with Roche Diabetes Care.

France > Private equity: LBO Tier 2

McDermott Will & Emery AARPI continues to build up its Paris private equity team with the arrival of Guillaume Kellner from Paul Hastings LLP in December 2020, further strengthening the practice’s capabilities in infrastructure deals and investment funds mandates. Focusing on mid-cap mandates, Grégoire Andrieux represents sponsors and management teams in LBOs, MBOs, VC funding, disposals and debt restructuring. Henri Pieyre de Mandiargues advises sponsors and investment vehicles on LMBOs and LMBIs. Drawing on the firm’s capabilities in tax, merger control, employment and regulatory services, the group is particularly active in the healthcare, life scenes and technology sectors.

Practice head(s):

Grégoire Andrieux; Henri Pieyre de Mandiargues

Other key lawyers:

Guillaume Kellner; Diana Hund

Key clients


Quilvest Capital Partners

Kamet Ventures

Azulis Capital

Montefiore Investment


Groupe IDI


Tiller Systems



Ardian Growth

BNP Paribas Développement

Bridgepoint Development Capital

Qualium Investissement



Andera Partners (ActoMezz)

Calcium Capital



Diabeloop SA

Work highlights

  • Advised Sogetrel and its management on part of the sale of Latour Capital’s shares in Sogetrel to its management team, supported by a consortium of investors.
  • Represented Abénex Capital, a pioneer in the French private equity market, in the sale of education group EUREKA, a player in private professional and higher education, to Naxicap Partners.
  • Advised Cafpi, a real estate brokerage network, in connection with the opening of its capital to the investment fund BlackFin Capital Partners.

France > Administrative and public law Tier 3

McDermott Will & Emery AARPI‘s practice is particularly well known for its strong sector approach. The firm notably advises leading players in the energy and telecoms sectors on strategic regulatory, public contracts and public law matters. Increasingly, the team is involved in the transport sector; it recently won a high-profile case regarding the legality of state aids provided to a public maritime transport line before the administrative court of appeal. Lately, the team has also handled significant work concerning healthcare and life-sciences product regulation, notably handling a strategic dispute regarding the sale of prescription drugs online. Sabine Naugès and Laurent Ayache co-head the practice, which also includes Charlotte Michellet who made counsel in 2021.

Practice head(s):

Sabine Naugès; Laurent Ayache

Other key lawyers:


‘A solid, responsive team, attentive to clients’ concerns and issues at hand; great transparency in invoicing.’

‘Great courtesy, which makes the working relationship very pleasant; exceptional quality of writing which allows the client to easily grasp analyses and legal opinions; cutting-edge expertise that adapts to the operational environment and that can be used and understood by the company.’

‘Very responsive and a permanent attention to problems and opportunities.’

‘High availability.’

‘Very competent; great strategists.’

‘Excellent advice on regulated sectors.’

‘Sabine Naugès’ expertise is particularly suited for public law litigation concerning regulatory decisions.’

‘Very high availability and responsiveness; very high added value advice.’

Key clients

Orange Group and its subsidiaries (Orange Marine, Orange RDC)

Engie and its galaxy (SHEM, Climespace, GRDF)

Groupe Action Logement

Aéroports de Paris (ADP)

Arriva Plc

Corsica Ferries

Remington Seeds

IPC Petroleum (ex-Lundin), Geopetrol and BridgeOil


Chambre de Commerce et d’Industrie du Var

Work highlights

  • Assisting Orange with a very high-profile dispute relating to 5G regulations.
  • Advised Vallourec on economic sanctions pronounced against it in Europe and the USA and on customs law issues.
  • Advising Engie on regulatory issues.

France > Banking and finance: transactional work Tier 3

Pierre-Arnoux Mayoly, who leads the banking practice at McDermott Will & Emery AARPI, has extensive experience of advising on fund finance transactions involving equity bridge and capital call facilities. The firm has a well-established reputation among leading financial institutions, private equity funds and debt funds. The group is also recognised for its work in mezzanine and unitranche financing and bond issuances.

Practice head(s):

Pierre-Arnoux Mayoly


‘Very good financing team working mainly on the sponsor side in acquisition financing and on the lender side in fund financing.’

‘Pierre Arnoux Mayoly is a very good, pragmatic and efficient lawyer.’

Key clients


Tikehau Capital


Andera Partners

RBC (Royal Bank of Canada)


Montefiore Investment




Qualium Investissement



Five Arrows Direct Lending


France > Capital markets: equity capital markets Tier 3

McDermott Will & Emery AARPI

Practice head(s):

Bertrand Delafaye; David Revcolevschi


‘Great knowledge of capital increase operation processes and related legal aspects, as well as regulatory expertise. Expertise in the management of transnational aspects.’

‘David Revcoleschi is our main contact and demonstrates not only a great knowledge of legal aspects, but also a very solid knowledge of the challenges of start-ups and biotechnology.’

Key clients


Aerkomm, Inc.

DBV Technologies



Invest Securities

Mauna Kea Technologies


KBC Securities

Bryan Garnier

Gilbert Dupont SG

Work highlights

  • Advised GeNeuro in relation to capital increase by way of an international private placement, providing French legal opinion on no registration with AMF and valid listing under French law.
  • Assisted Sensorion with a 3.7% ownership stake acquisition by Sonova Holding AG (headquartered in Switzerland) by way of subscription to a reserved share capital increase for total gross proceeds of €5m.
  • Advised Invest Securities and Aerkomm, Inc. in relation to a public offering of up to €40m in new shares of its common stock.

France > Data privacy and data protection Tier 3

McDermott Will & Emery AARPI's data protection and privacy expertise spans the automotive industry, the life sciences sector, consumer goods, and the public sector. With a strong client base of start-ups with a focus on the AI, big data and health sectors, the firm has worked with members of the Paris Biotech incubator. Romain Perray‘s team has ‘real expertise‘ and a ‘tailor-made approach‘ in finding solutions to complex issues.

Practice head(s):


‘Strong expertise in a new field.’

‘Good firm, good GDPR expertise, also provides relational help with the CNIL.’

‘Real expertise, tailor-made approach, knowledge of data protection and health law ability to adapt to customer needs.’

‘I work with Romain Perray and Lorraine Maisnier-Boche. I appreciate their expertise, their availability as well as the pragmatic and tailor-made approach they adopt.’

‘I work with Romain Perray who is very knowledgeable about his subject matter and his sector. In addition, his personal qualities make interactions pleasant.’

‘Romain Perray and his team have assisted us with various aspects of GDPR-related data privacy matters. The firm’s client service has been consistently good.’

‘Romain Perray is very specialised in data privacy matters and is very knowledgeable about recent developments and trends in his areas of expertise’

‘Mai Matsubara is a budding young lawyer with a good specialist knowledge of data privacy law, whose multi-lingual skills and understanding of our business are a particular asset for us.’

Key clients

Nissan Motor Co & Nissan International

PSA (Peugeot)



Aptar Group



Big Groupe


Work highlights

  • Assisted Renault group with the implementation of its GDPR compliance program.
  • Assisting iAdvize with conducting in-depth analysis and DPIA on the use of cookies and tracking devices of full audience and targeting purposes when using chatbots.
  • Advising Rexair LLC in conducting a GDPR/CCPA Compliance Program for its US headquarters; conducting transfer impact assessments; drafting accountability and transparency documentation and other internal policies.

France > Dispute resolution: White-collar crime Tier 3

McDermott Will & Emery AARPI ‘s practice handles a wide range of cases, spanning defamation, anti-corruption, fraud, securities and corporate compliance matters. They have also notably assisted one of France’s blue chip companies which is facing corruption and fraud investigations in France and overseas. They are acting in several matters in the political sphere, such as the defence of a former public servant in a headline trial.


‘Very specialised team on matters such as compliance, internal investigations, and  criminal business law (corruption).’

Key clients

Crédit Immobilier de France (CIF-D)

France > Dispute resolution: Commercial litigation Tier 4

McDermott Will & Emery AARPI

Practice head(s):

Nicolas Faguer


‘Good for complex litigation work in France.’

Key clients

Corsica Ferries

Qualium Investissement

Malakoff Humanis






France > Insolvency Tier 4

McDermott Will & Emery AARPI advises debtors, shareholders, commercial partners, state-owned banks and investors. The practice is regularly retained for complex mid-size market cases, but also shows solid ability to handle cross-border issues. The team recently worked on a good volume of restructuring matters spanning various industry sectors, including the retail, industrial manufacturing, aviation, hospitality and automotive. Timothée Gagnepain directs the practice which includes associates Théophile Jomier  and Lucille Madariaga.

Practice head(s):

Timothée Gagnepain

Other key lawyers:

Théophile Jomier; Lucille Madariaga


‘The team is very aware of market practices (constantly evolving in this Covid-19 period). The fluid professional relationships that the restructuring team maintains with the various market players help to resolve very effectively the restructurings in which it is involved. All the members of the team are involved, responsive and proactive, with a constant concern for the interests of the client, whatever the problems encountered.’

‘Timothée Gagnepain is personally involved in all important aspects of the files and is very available. His presence in particular in the negotiations is invaluable, his interventions particularly relevant and his energy in resolving blocking points highly appreciated. His associate Théophile Jomier is excellent, both in his relations with clients and in his legal approach to cases. Lucille Madariaga is also greatly appreciated for her responsiveness and in-depth knowledge of the cases handled.’

‘Great team and firm.’

‘The team is incredibly knowledgeable in insolvency proceedings. From the early guidance through resolution, we found the team collaborative with other counsellors, with the state, and with the administrator.’

‘Timothée Gagnepain and Théophile Jomier were EXCELLENT legal representatives of our case. They were incredibly responsive. We were always made to feel that our case was of the utmost importance to them, even as the case was wrapping up.’

‘A small and structured team which positioned itself on the biggest files. Indispensable team in the restructuring sector.’

‘Timothée Gagnepain is well known in the business. Also qualified at the NYC bar, Timothée is versatile and a formidable litigator!  It is also worth noting the great qualities of Lucille Madariaga who is on the path of becoming a partner.’

Key clients

Bio C Bon

Paper Excellence

LGT Private Debt


Bpifrance Investissement

Paule Ka

Agence Française de Développement

Work highlights

  • Assisting the court-appointed liquidators of the Bio C Bon group with its acquisition by Carrefour.
  • Assisted the Canadian group Paper Excellence with the restructuring of one of its French subsidiaries, Fibre Excellence Tarascon.
  • Assisted private equity fund Abénex with difficulties faced by two of its portfolio companies.

France > Mergers and acquisitions Tier 4

McDermott Will & Emery AARPI

Other key lawyers:

Jacques Buhart; Bertrand Delafaye; Guillaume Kellner; Nicolas Lafont

Key clients

Cryoport Systems

Pierre Fabre


Récupération Valorisation Aluminium (‘RVA’)


Gallimard/ Madrigall

Action Logement

Avison Young


Deluxe Media


Tiller Systems


Maïsadour and Groupe Aqualande

ESI Gorup

Work highlights

  • Advised Pierre Fabre, a French pharmaceutical and dermo cosmetics group, on the sale of the brand Galénic, expert in face care, to Yatsen, a Chinese cosmetics company.
  • Advised Yposkesi, 1st French pharmaceutical manufacturer dedicated to the production of gene and cell therapy drugs for rare diseases, on its acquisition by SK Holding, a South-Korean investment conglomerate.
  • Represented the shareholders of Récupération Valorisation Aluminium (‘RVA’), a France-based specialist in salt slag recycling on the sale of RVA to US-based Real Alloy, a leading recycler of aluminum and light metals.

France > Tax Tier 4

Led by Antoine VergnatMcDermott Will & Emery AARPI's tax team provides assistance to the firm’s corporate and private equity practice. The team assists investment funds and management teams with LBO transactions, often in the mid-cap segment of the market, as well as with venture investments, notably in the IT and biotechnology sectors. The tax team has strong cross-border capabilities. Its in-depth knowledge of the healthcare sector is another asset. The practice's stand-alone caseload includes assisting companies, private clients and funds with tax restructuring, trust, audit and litigation work. Counsel Romain Desmonts is also noted.

Practice head(s):

Antoine Vergnat

Other key lawyers:

Romain Desmonts


Responsive and precise. They take a stand.

Key clients

Tiller Systems

Ardian Growth and BNP Paribas Développement



Qualium Investissement


Pierre Fabre

Eurazeo PME


Management team of Sogetrel




Naxicap Partners



Work highlights

  • Advised CAPZA in the context of its acquisition of a minority stake in the Magellan Partners Group.
  • Advised Tiller Systems on its sale to SumUp.
  • Advised the founders of the CAFPI, a real estate brokerage network, in connection with the opening of its capital to the investment fund BlackFin Capital Partners.

The firm: McDermott Will & Emery partners with leaders around the world to fuel missions, knock down barriers and shape markets. Our team works seamlessly across practices, industries and more than 20 locations to deliver highly effective—and often unexpected—solutions that propel success. More than 1,400+ lawyers strong, we bring our personal passion and legal prowess to bear in every matter for our clients and the people they serve.

Areas of practice: The Paris office plays an important role for the firm internationally, helping French businesses strengthen their positions domestically, throughout Europe, the Middle East, Africa and around the world. The Paris lawyers also advise foreign and multinational investors, companies and financial institutions seeking to enter the marketplace in France. As part of an international network of collaborative lawyers, McDermott’s professionals share ideas on trends and key developments in law and on the numerous industries in which its clients operate, resulting in seamless, multidisciplinary service to its clients.

The team advises clients across numerous areas of law, including corporate, mergers and acquisitions, private equity, securities and listing transactions, corporate restructuring and bankruptcy law. The team represents clients in a wide range of industry sectors including, but not restricted to, energy (with an emphasis on projects in Africa), tour operating and telecommunications. The Paris energy practice is a dedicated team of lawyers with a strong sector focus on energy, oil and gas, and related areas such as natural resources and commodities. The team advises energy producers and traders in the US, Europe, Africa, the Middle East and Asia. The Paris lawyers also counsel clients on matters involving general commercial law, with a focus on the pharmaceutical, life sciences, medical device, biotech and healthcare industries. The dispute resolution lawyers advise on international arbitration and public law, and counsel on behalf of companies in civil, criminal and administrative matters. The employment practice advises businesses on issues such as termination, discrimination, harassment, restrictive covenant breaches, strikes and other collective conflicts, and counsels clients on the labour and employment aspects of domestic and transnational commercial matters. Furthermore, the Paris lawyers advise on the full range of EU competition issues, litigation and international tax issues. With a diversified business practice, the firm represents a wide range of commercial, industrial and financial enterprises, including publicly traded and privately held companies.

The Paris team and individual lawyers are recognised for the quality, consistency and creativity of their legal counsel. As part of a global, full-service law firm, the lawyers of the Paris office are prepared to help clients wherever their business interests take them.

Corporate Jacques Buhart
Corporate Jonathan Wohl
Corporate Guillaume Kellner
Corporate Bertrand Delafaye
Corporate Nicolas Lafont
Mergers and acquisitions Guillaume Kellner
Mergers and acquisitions Bertrand Delafaye
Antitrust and competition Jacques Buhart
Antitrust/Competition Frédéric Pradelles
Tax Antoine Vergnat
Employment Jilali Maazouz
EU competition Jacques Buhart
Litigation Nicolas Faguer
Litigation, Public law Laurent Ayache
Public law, regulatory and government strategies Sabine Naugès
Private equity Henri Pieyre de Mandiargues
Health, life sciences Emmanuelle Trombe
Health, life sciences Anthony Paronneau
Banking and finance Pierre-Arnoux Mayoly
Intellectual property Laura Morelli
Privacy & Cybersecurity Romain Perray
Business Restructuring Timothée Gagnepain
Capital Markets David Revcolevschi
Capital Markets Bertrand Delafaye
Grégoire Andrieux photoMr Grégoire AndrieuxGrégoire Andrieux is a partner, he focuses on domestic and international mergers and…
Laurent Ayache photoMr Laurent AyacheLaurent Ayache is a partner and co-head of the Regulatory Practice in…
Jacques Buhart photoMr Jacques BuhartJacques Buhart is a partner, he focuses his practice on cross-border mergers…
Romain Desmonts photoMr Romain DesmontsRomain Desmonts focuses his practice on tax advice to French and multinational…
Shirin Deyhim photoMs Shirin DeyhimAssociate Shirin Deyhim focuses her practice on structured finance transactions; in particular…
Timothée Gagnepain photoMr Timothée GagnepainPartner Timothée Gagnepain focuses his practice on complex restructurings and insolvencies, both…
Théophile Jomier  photoMr Théophile Jomier Théophile Jomier focuses his practice on complex corporate transactions, in particular, on…
Guillaume Kellner photoMr Guillaume KellnerGuillaume Kellner focuses his practice on mergers and acquisitions, private equity, and…
Jilali Maazouz photoMr Jilali MaazouzJilali Maazouz is a partner, focusing his practice on labor and employment,…
Lucille Madariaga photoMs Lucille MadariagaLucille Madariaga focuses her practice on complex commercial transactions, insolvency proceedings and…
Pierre-Arnoux Mayoly photoMr Pierre-Arnoux MayolyPartner Pierre-Arnoux Mayoly focuses on structured finance matters, in particular in the…
Sabine Naugès photoMs Sabine NaugèsSabine Naugès is a partner, her practice focuses on all aspects of…
Anthony Paronneau photoMr Anthony ParonneauAnthony Paronneau is a partner, he advises clients on all aspects of corporate and…
Romain Perray photoMr Romain PerrayRomain has extensive experience in data privacy and data protection law, and…
Henri Pieyre de Mandiargues photoMr Henri Pieyre de MandiarguesHenri Pieyre de Mandiargues is a partner, he focuses on private equity transactions,…
Emmanuelle Trombe photoMs Emmanuelle TrombePartner Emmanuelle Trombe represents pharmaceutical, medical device and bio-pharmaceutical companies globally in…
Antoine Vergnat photoMr Antoine VergnatPartner Antoine Vergnat focuses his practice on advice to French and non-French…
Number of lawyers : 1200
at this office : 71
All main business languages
Strategic alliance with MWE China Law Offices
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