Fielding a sizeable administrative practice, Marval O’Farrell Mairal is well positioned to advise local and foreign clients from the energy, mining, natural resources, infrastructure, construction, banking, and TMT sectors on the full spectrum of public law matters. In addition to its strong credentials in PPPs and infrastructure projects, the group is also adept in public law litigation, concession contracts, investment disputes, negotiations with regulatory authorities and transactions involving highly regulated sectors. It also stands out for its strong expertise in navigating land disputes with indigenous groups. Co-head Héctor Mairal, a reference in the market for administrative law issues, has a wealth of experience in public bids, government contracts, and litigation. María Lorena Schiariti, who handles transactional, advisory and contentious work in the infrastructure and energy sectors, and public services, and Enrique Veramendi, whose areas of expertise include government contracts, disputes with government agencies, public procurement and constitutional litigation. The senior team is completed by Gonzalo Santamaria, who is experienced in public, administrative and energy law matters, with a particular focus on power transactions, and Milagros Ibarzábal, who was promoted to partner in August 2025. Key associate support is provided by Sofia Cimmarusti and María Mercedes Mahomed.
Legal 500 Editorial commentary
Accolades
Client satisfaction
Testimonials
Collated independently by Legal 500 research team.
'Excellent team led by Enrique Veramendi. His dedication and commitment to his clients are unmatched.'
'The Marval team offers high-end, perfect legal advice tailor-made for the clients' needs.'
'In very complex multi-jurisdictional projects, Marval is able to adjust to the client's requirements and is capable of perfect team organisation and teamwork with the other teams.'
'Enrique Veramendi stands out with his deep market knowledge and excellent legal capabilities, always paired with the ability to guide the team working in the international context.'
'Enrique Veramendi is dedicated and committed to his clients. He demonstrates rigour and extensive knowledge of the business.'
'The professional and human quality of the team is excellent. They understand the client's business and needs, and their legal knowledge allows them to offer the best solutions to clients.'
Key clients
- Autopistas del Sol
- Amcor Specialty Cartons Argentina
- AWS
- Flybondi
- Grupo Concesionario del Oeste
- Golar LNG
- GE Healthcare
- Telecentro/DirecTV
- Webuild
- White & Case
Work highlights
Advised Dredging International NV Sucursal Argentina regarding its participation and challenge of the procurement processes for the granting of strategic dredging works in the main Argentine waterway.
Advised Autopistas del Sol / Grupo Concesionario del Oeste in connection with the implementation and enforcement of the renegotiation agreement of their concession contracts, and related disputes.
Advised Gezohuba Group and Eling Energía on the renegotiation of a public works contract for the construction of two hydroelectric dams in the Province of Santa Cruz.
Lawyers
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Leading partners
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Next Generation Partners
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Leading associates
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Practice head
Héctor Mairal; María Lorena Schiariti; Enrique Veramendi
Other key lawyers
Gonzalo Santamaria; Milagros Ibarzábal; Sofia Cimmarusti; María Mercedes Mahomed