Marval O'Farrell Mairal

Walter César Keiniger

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Practice Areas

Expert in tax law. Advises national and multinational companies in cross-border transactions, transfer pricing, M&As, business restructuring, tax-free reorganizations and real estate projects. Expert in complex tax litigation.


Joined Marval, O’Farrell & Mairal in 1999; partner since 2007. Gutman – boutique tax litigation firm, 1995-99.

Professional Memberships

Member of the Argentine Fiscal Association.


Area of practice articles and books; regular speaker in conferences. Professor at Graduate Tax Programs including University of Miami and University of Florida (USA).


Lawyer – Tax Law specialization, Universidad de Buenos Aires; Graduate Tax Program, Universidad de Buenos Aires; Graduate Tax Program (LLM in Taxation), University of Florida, USA.