Uriel F. O'Farrell > Estudio O'Farrell > Buenos Aires, Argentina > Lawyer Profile

Estudio O'Farrell
AV. DE MAYO 645/651
Uriel F. O'Farrell photo

Work Department

Corporate & M&A - Banking & Finance -  Energy & Natural Resources


O’Farrell’s Senior Partner, Uriel F O’Farrell, focuses his practice on corporate work, M&A, and energy transactions, regulation and disputes. He joined the firm in 1977.


During 1978 Mr. O´Farrell worked in Ford Motor Company Legal Department (Dearborn Michigan, USA).

Mr. O´Farrell advised numerous domestic and foreign companies in corporate matters and in the energy and infrastructure sectors including oil production and exploration; natural gas production and distribution and electricity generation, transmission, marketing and distribution.
In the above mentioned areas he has participated in large mergers and acquisitions (M&A) and privatizations transactions, financing, regulatory advice, litigation and arbitration including investment treaty arbitration.

Among others, Mr. O´Farrell has advised Pampa Energía S.A., and its electricity distributors and power generating companies as well as The National Grid Co. Plc, Duke Power, the Uruguay electricity and gas utilities (UTE), EXXON, Gas Natural SDG, Suez, ENI S.p.A. (Italy) and YPF S.A. and Compañía General de Electricidad.


Spanish, English and French.


Member of the International Bar Association in the area of Energy and Natural Resources Law (SEERIL).
Member of the City of Buenos Aires Bar Association, where he was a member of its Board of Directors between 1986-1989 and 2016-2019.


He is a lawyer graduated from the Law and Social Sciences School of Universidad de Buenos Aires. He focused his post-graduate studies on legislation related to businesses and economic transactions.

He attended the Academy American and International Law, The Southwestern Legal Foundation (Dallas, Texas, USA) in 1988.

Lawyer Rankings

Argentina > Banking and finance

Estudio O’Farrell’s close relationship with YPF remains its main source of capital markets work and the team routinely advises the energy giant, and its subsidiaries, on its local and international bond offerings. Less frequently, the firm acts for other corporate issuers, underwriters and lenders on capital markets and corporate lending transactions. Department co-head Sebastián Luegmayer has a strong track record in capital markets and structured finance transactions, and he also advises on regulatory issues. High-profile energy specialist Uriel O’Farrell co-leads the group.

Argentina > Energy and natural resources > Electricity

(Leading individuals)

Uriel O’FarrellEstudio O’Farrell

Estudio O’Farrell’s highly regarded team is comprised of ‘specialists with an integral vision and highly qualified knowledge in the different aspects of the market’, according to sources. The firm packs a punch in all key pillars of electricity law, with strong skill sets in regulatory, transactional and contentious matters. On the regulatory front, the multidisciplinary practice advises some of the country’s largest power companies (including YPF Energía Eléctrica, Pampa Energía and Transener) on regulatory compliance and administrative challenges. On the transactional side, the group is routinely engaged by energy companies seeking support on M&A, joint ventures and project finance. It also excels in complex litigation, where its ability to lean on the firm’s robust public law and economic regulation departments is a significant asset. Senior partner Uriel O’Farrell is a stand-out specialist in the power area, with premier sector expertise in M&A, privatisation transactions, regulation and dispute resolution. Other key contacts include economic regulation specialist Agustin Siboldi, who is highly regarded for his experience in regulatory and contentious matters, and Agustina Fanelli Evans, who is recommended for her strength in public law issues.

Argentina > Energy and natural resources > Oil and gas

Estudio O’Farrell stands out for its ‘vast experience’ and ‘highly qualified specialists’. The team is best known for its regulatory expertise, in line with the firm’s signature strength, and it notably played a significant role in the development of the hydrocarbons regime in Argentina through its close relationship with state-controlled energy company, YPF. The team also frequently advises on transactional and contentious matters. Senior partner Uriel O’Farrell co-heads the team and is recognised for his broad energy practice, which spans power, oil and gas. Group co-lead Agustín Siboldi specialises in public law and economic regulation.

Argentina > Corporate and M&A

Lawyers at Estudio O’Farrell are lauded for their ‘exhaustive analysis’, ‘personalised service’ and ‘dedication to their work’. Among its industry sweet spots, the firm’s market-leading power practice spins off a significant volume of transactional work, especially for key client YPF. The team also handles a steady stream of oil-and-gas, agribusiness and TMT-related matters. Energy specialist Uriel O’Farrell co-heads the practice together with up-and-coming transactional partner Juan Pablo Fratantoni and Ernesto Genco, who focuses on foreign investments, joint ventures, reorganisations and M&A. Nicolás Benvenuto is a talented corporate associate.