O’Farrell

O’Farrell

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José María Allonca

José María Allonca

José María Allonca delivers strategic cross-border counsel, grounded in decades of experience and a comprehensive command of international corporate and tax law. His guidance consistently advances legal solutions for clients throughout Latin America and beyond. José María recently joined O’Farrell as a Consulting Partner. He specializes in cross-border transactions, corporate structuring, international tax planning, and complex regulatory matters affecting both local and multinational clients. His practice focuses on: – Corporate and commercial law, including mergers and acquisitions, joint ventures, and international partnership structuring. – Regulatory compliance, particularly Life Sciences, TMT, Agribusiness, and related industrial sectors. – Tax and business planning for multinational entities entering or operating within Argentina, Brazil, Chile, and other Latin American jurisdictions. – Strategic advisory on market entry, business development, and dispute resolution in cross-border contexts.
Agustina Barberis

Agustina Barberis

Agustina Barberis focuses her practice on corporate law. Her professional career combines experience in law firms and as an in-house lawyer for international companies in the technology, industrial, financial, and humanitarian sectors, both in Argentina and France. Her practice focuses on assisting clients, especially foreign clients, in the development and management of their operations in Argentina. Her experience includes advising on contractual matters, providing legal support in day-to-day commercial management and adapting internal corporate policies and guidelines to local regulations, as well as creating and implementing compliance programs and anti-corruption policies.
Ignacio Agustín Castiglione

Ignacio Agustín Castiglione

Ignacio Castiglione is Partner of the Labor and Social Security Department. He joined O’Farrell in 2011. His activity focuses on preventive counseling and the resolution of labor disputes, whether individual or collective, negotiation of collective bargaining agreements with labor unions, managing labor complex proceedings and labor counseling in mergers and acquisitions proceedings. Ignacio advises companies related with diverse activities such as automotive, power, gas, textile, tourism, IT, insurance, pharmaceutical, retail, construction, and telecommunications, among others.
Nicolás Fernández Madero

Nicolás Fernández Madero

Nicolás Fernández Madero was an associate at the firm from 2007 to 2015, and has served as Senior Counsel since 2024. He specializes in corporate law, banking and finance, capital markets, fintech and blockchain. Prior to joining O’Farrell, he was a Partner at DLA Piper, primarily advising local and international fintech and blockchain companies on their operations and business establishment in Argentina, and also was a Senior Counsel at Mitrani, Caballero & Ruiz Moreno, forming part of the corporate, banking and finance team, were he worked in M&A and capital market transactions. Recognized by The Legal 500 Latam 2024 as a key name of Mitrani Caballero Ruiz Moreno’s banking and finance team, in the practice of fintech and cryptoassets.
Juan Matienzo

Juan Matienzo

Juan Bautista Matienzo joined O’Farrell in 1996 and is a lawyer in the Litigation Department. He has worked in O’ Farrell advising several companies of various issues (contracts, tax, business affairs, guarantees). Concurrently, he was in charge of the supervision and general management of more than two thousand trials in civil, commercial, tax and contentious-administrative matters, pending before courts of the City of Buenos Aires and various provinces in Argentina. He is currently in charge of a large litigation portfolio in civil and commercial matters, pending before courts of the City of Buenos Aires and various provinces in Argentina.
Ana Belén Micciarelli

Ana Belén Micciarelli

Ana Belen Micciarelli is a Partner in the Public and Administrative Law area. She joined the firm in 2015. Ms. Micciarelli’s practice focuses on assisting clients operating in highly regulated markets -including energy, gas, mining, hydrocarbons, telecommunications and personal data-, as well as advising on public procurement (goods, services and public works), both in federal, provincial and municipal jurisdictions. She stands out for her experience in public and private infrastructure works and in sustainability matters.
Gustavo Enrique Müller

Gustavo Enrique Müller

Gustavo E. Müller is the lawyer in charge of the International Trade and Customs Law Area. His activity is focused on international trade and customs law, antidumping and regulation of international trade. Mr. Müller advises, represents and sponsors leading automotive, energy, food, chemical and supermarket companies, among others, as regards the import and export of goods and services, foreign exchange, promotional regimes, Duty Free Areas, Special Customs area and dumping issues, etc.
Uriel F. O\'Farrell

Uriel F. O\'Farrell

Uriel Federico O’Farrell, Honorary Partner of O’Farrell, is specialized in corporate law, mergers & acquisitions, and energy (transactions, regulation and litigation). Extensive experience across the energy value chain, including power generation, electricity transmission and distribution, oil & gas exploration and production, natural gas transportation and distribution, infrastructure projects and energy-related M&A transactions. He regularly advises sponsors, investors, utilities and multinational energy companies on regulatory matters, project structuring, financing, disputes and strategic transactions.
Agustín Sibold

Agustín Sibold

Agustín Siboldi, Partner of the Public Law and Economic Regulation Area, specializes in Antitrust, Energy and Natural Resources, and Telecommunications. His practice focuses on the following areas in relation to economic regulation: antitrust, including economic concentrations and investigations in anticompetitive practices; telecommunications; exploration, concession, exploitation and transport of hydrocarbons; generation, transmission, distribution and commercialization of electricity; transport, distribution and commercialization of gas; commercialization of medicines; among other heavily regulated industries.
Agustín Siboldi

Agustín Siboldi

Agustín Siboldi, a Partner of the Public Law and Economic Regulation Area, specializes in Antitrust, Energy and Natural Resources, and Telecommunications. His practice focuses on the following areas in relation to economic regulation: antitrust, including economic concentrations and investigations in anticompetitive practices; telecommunications; exploration, concession, exploitation and transport of hydrocarbons; generation, transmission, distribution and commercialization of electricity; transport, distribution and commercialization of gas; commercialization of medicines; among other heavily regulated industries.