Mr Francisco A Macias > Marval O’Farrell Mairal > Buenos Aires, Argentina > Lawyer Profile

Marval O’Farrell Mairal
Francisco A Macias photo

Work Department

Oil & Gas / Environment / Power.


Francisco A. Macías specializes in oil & gas, power, public services, infrastructure, natural resources, environmental law and protection of foreign investment. His practice is mainly focused on international and local oil & gas, infrastructure and power transactions. He also advises clients on gas and power regulatory matters and a wide range of oil & gas and power contracts.


Francisco has been a partner of Marval, O’Farrell & Marval since 2002. Before joining the firm he worked for the firm of Bazán, Cambré & Orts advising on oil & gas upstream and midstream transactions and environmental matters, from 1994 until 1997. He also worked for BBVA Banco Francés from 1993 until 1994.


English, French, Italian & Spanish.


He graduated from the Law School of the Argentine Catholic University in 1991 and obtained a Post Graduate Degree in International and EC Law from the School of Law of the University of Siena, Italy, in 1993. In 1992 he obtained a postgraduate degree in International Operations from the National Foreign Office Institute of Argentina -ISEN-.

Lawyer Rankings

Argentina > Environment

(Leading individuals)

Francisco MacíasMarval O’Farrell Mairal

Marval O’Farrell Mairal’s team impresses with its ‘professionalism’, ‘immediate response’ and ability to remain ‘informed on all topics’. A popular choice to represent major global energy and infrastructure companies on high-stakes and highly sensitive environmental litigation, the group also advises on regulatory issues and M&A related matters. Francisco Macías, who brings to bear strong experience in energy and infrastructure-related work, heads the department. Senior associate Gabriel Fortuna and semi-senior associate Jimena Montoya are also noted for their increasing prominence in the environmental law area.

Argentina > Energy and natural resources > Oil and gas

(Leading individuals)

Francisco MacíasMarval O’Farrell Mairal

Marval O’Farrell Mairal finds favour for its ability to bring an ‘out-of-the-box perspective’ to its oil-and-gas work. The experienced group is well versed across the full hydrocarbons supply chain, from exploration and production through to midstream and downstream issues. On the transactional side, the team kept busy advising on bid rounds, farm-in agreements and restructuring matters. It also has a prominent position in regulatory and contentious work, with recent roles on several high-profile disputes for companies such as Roch and Shell. High-profile figure Francisco Macías is an oil-and-gas expert, who advises on transactions, contracts and regulatory issues. M&A and capital markets partner Ricardo Beller is noted for oil-and-gas transactions. Senior associate Jimena Montoya is also recommended for her focus on energy work.

Argentina > Energy and natural resources > Electricity

Arguably best known for its corporate strength, Marval O’Farrell Mairal’s power practice also deserves credit for its robust commercial and regulatory expertise. Most notably, the energy group is working alongside the firm’s banking and administrative law teams to advise China Gezhouba Group on regulatory power issues and contract negotiation related to the development of the largest hydroelectric project under construction in the country. Sebastián Iribarne leads the electricity practice and has strong transactional experience. Francisco Macías heads the overarching energy department and is recommended for regulatory and transactional matters. Public law associate Gonzalo Santamaria is a talented rising star.