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  • Universidad de Buenos Aires (Attorney-at-law, 1983)

  • Universidad de Buenos Aires (Attorney specialized in Administrative Law and Public Administration, 1986)

  • Universidad de Buenos Aires (Ph.D. in Administrative Law, 1991)


  • Spanish

  • English



  • City of Buenos Aires

Guido Santiago Tawil

+54 11 4321 7506


Guido Santiago Tawil is one of our senior partners. He heads the Administrative Law & Economic Regulation and Arbitration practices of our firm.

Since joining our firm as partner in 1993, he has represented some of the most important domestic and foreign companies in matters related to telecommunications, electricity and gas generation, transportation and distribution, postal services, water and sewage services, public works, airports, IT, grains production and trading, among others.

Mr. Tawil and his team have successfully represented bidders during the concession and privatization processes of most of those services in Argentina and other Latin American countries and he continues advising the companies supplying such services in all matters related to economic regulation, court and administrative processes, and contractual negotiations.

The team headed by Mr. Tawil has actively taken part in several matters considered milestones in Argentina, such as the first electricity sale agreement; the first electricity export agreement; the development of a new electrical grid linking the Comahue region and Buenos Aires; the first electricity supply agreement, the first five-year rate review in the gas industry, disputes arising of restrictions to the export of gas and electricity; limitations to internal and external trade; the telecommunications tariff rebalancing and disputes arising from the universal service implementation, among others.

Mr. Tawil is also known for his participation in international arbitrations under the rules of the International Chamber of Commerce (ICC), LCIA, ICSID, AAA/ICDR, Stockholm Chamber of Commerce, Energy Charter Treaty and UNCITRAL -among others- as chair, arbitrator, counsel and/or independent expert appointed by the Argentine Republic, former State-owned companies, governments and domestic and foreign private companies.

He advises on a regular basis several foreign governments and institutions on issues related with economic regulation, having been entrusted with the drafting of relevant rules related to such area and administrative law. Due to his experience on the matter, he has worked in different projects funded by the World Bank and other multilateral entities intended to improve State operations and regulations in Argentina and other countries of the region.

Mr. Tawil serves as Chair Professor of Administrative Law at the Universidad de Buenos Aires School of Law and of Economic Regulation in the Administrative Law Master Program at Universidad Católica Argentina. He is one of the ten chair members of the Universidad de Buenos Aires School of Law Ph. D. Commission. He has served as Chair Professor of Public Utilities and Economic Regulation in the Administrative Law Master Program at Universidad Austral; as Visiting Professor at Universidad de Barcelona and Universidad Andina Simón Bolivar and as Visiting Scholar at the University of California Boalt Hall School of Law (Berkeley).

Mr. Tawil was appointed by the Argentine Ministry of Justice as member of the Advisory Committee on Administrative Regulation, of the committee responsible for drafting Argentina´s Code of Administrative Procedure (2000) and of the Scholars’ Committee responsible for drafting Argentina´s Uniform Code of Legislation. He is currently a member of the Committee in charge of reviewing the Province of Buenos Aires Administrative Procedure Act.

Before joining our firm, Mr. Tawil served as Commissioner of Argentina´s Securities & Exchange Commission (Comisión Nacional de Valores) and as Secretary of Argentina´s Federal Supreme Court of Justice (position equivalent to federal judge).

He is President and Founding Member of the Latin American Arbitration Association (Asociación Latinoamericana de Arbitraje); Council Member of the International Bar Association´s (IBA) LPD Council (2011-2014); Governing Council Member of the International Council for Commercial Arbitration (ICCA); Court Member of the London Court of International Arbitration (LCIA); Member of the Executive Committee and Academic Council of the Institute for Transnational Arbitration (ITA); Member of the ICC´s Latin American Arbitration Group; Member of the Foundation for International Arbitration Advocacy´s (FIAA) Executive Committee; Member of the Board of the Buenos Aires Rotary Club, Member of the Administrative Law Institute of the National Law Academy; and of the Argentine Chamber of Commerce´s (CAC) Advisory Committee, among other institutions. Previously, he has been Co-Chair of the IBA´s Arbitration Committee (2009-2010) and Latin American Forum (2008) and of the Young Lawyers’ Division of the Buenos Aires Bar Association (Colegio de Abogados de la Ciudad de Buenos Aires).

Several local publications have considered Mr. Tawil as one of the most relevant Argentine lawyers in any area of law. In addition, international publications such as Chambers and Partners, Latin Lawyer, Who's Who Legal, and Global Counsel have distinguished Mr. Tawil as one of the leading Argentine lawyers in the economic regulation, energy and dispute resolution areas. Global Arbitration Review distinguished in 2006 Mr. Tawil as the only lawyer then based in Latin America to be included in the 45 world arbitration leaders under 45 years old.

Mr. Tawil has published seven books and over 130 articles and other papers related to his areas of practice. He has delivered more than 350 conferences in Argentina and abroad, and was awarded with the Universidad de Buenos Aires School of Law Award for the best doctoral dissertation in all areas of law and with the "Alejandro E. Shaw Award" provided by the Buenos Aires Bar Association for the best legal contribution in administrative and commercial law.

Mr. Tawil received his law degree in 1983, a Master degree in Administrative Law and Public Administration in 1986, and a Ph. D. from the Universidad de Buenos Aires (Administrative Law Area) in 1991, with the highest academic qualifications, all of them issued by the Universidad de Buenos Aires School of Law.

He was admitted to the bar by the Federal Supreme Court of Justice in 1984.