Mariana Tavares

Mariana Tavares has been focusing her professional activity on European Law, competition law and regulated sectors.


Mariana Tavares has focused her professional career on the fields of EU law, competition law and regulated economic sectors. 

She served as a law clerk (référendaire) at the Court of Justice of the European Union and was a United Nations International Consultant for competition matters. She held several senior positions at the Portuguese Competition Authority and has been closely involved with the development of European and international competition law and policy. Mariana Tavares served as chair of several Working Groups of the European Competition Network and the International Competition Network and she also participated actively in the work of the BRICS Competition Law and Policy Centre, OECD, UNCTAD and the EU-China Trade Project.

Law clerk (référendaire) at the Court of Justice of the European Union, Cabinet of the Judge Nuno Piçarra (2018 – 2020).

Chief of Staff of the President of the Competition Authority (2013 – 2015).

United Nations International Consultant for competition matters (2013).

Professor at Global School of Law – Universidade CAtólica Portuguesa - LLM Law in European And Global Context (2012 – 2018).

Member of the Working Group of the Ministry of Economy and Employment for the revision of the Portuguese Competition Law (2011).

Director of the Office of European and International Relations at the Competition Authority (2008 – 2013).

Legal advisor to the Board of the Competition Authority (2007 – 2008)

Assistant professor at ISEG – Lisbon School of Economics and Management, University of Lisbon (2006 – 2013).

Case handler at the Restrictive Practices Department at the Competition Authority (2004 – 2007).

Trainee at the General Court of the European Union (then Court of First Instance), Cabinet of the Judge Rui Moura Ramos (2002).

Intern at the European Commission – Legal Service (2001-2002). 

Selected publications:

“The Law And Politics Of Global Competition”, with Christopher Townley (Law School, King’s College London) and Mattia Guidi (Dipartimento Di Scienze Sociali, Politiche E Cognitive, Università Degli Studi Di Siena), Oxford University Press, Oxford, UK, (forthcoming) January 2022.

“Law and Politics Of Global Competition – Why And How Non State Actors Seek Influence In The ICN”, with Christopher Townley (Law School, King’s College London) e Mattia Guidi (Dipartimento Di Scienze Sociali, Politiche E Cognitive, Università Degli Studi Di Siena), Utilities Law Review, Volume 24, (forthcoming) 2022.

“The Hard Side Of Soft Power: The Portuguese Competition Authority Recommendation To The Government On Stranded Costs In The Electricity Sector”, Competition Law Challenges In The Next Decade, Sofia Oliveira Pais (Ed.) Peter Lange, Oxford, New York, Brussels, 2016.

“How To Enhance The Enforcement Of EU Competition Law In The Absence Of Harmonized Procedural Rules?”, Competition Policy International, Antitrust Chronicles, Jun 13(2), Summer 2013 Volume 6, Número 2.

“The Next Generation Of Competition Law In Portugal,” with António Ferreira Gomes, Mlex Magazine, July – September 2012.

“The ICN One Of The Many International Priorities”, The International Competition Network At Ten, Origins, Accomplishments And Aspirations, Essays. Paul Lugard (Ed.) Intersentia, Cambridge, Antwerp, Portland, 2011.

“International Cooperation As An Effective Tool For Competition Enforcement: The Brazilian And Portuguese Cooperation Experience”, with Mariana Tavares De Arajo Concurrences, N° 3-2011, N.º 37131.

“The Greek, Irish And Portuguese Governments Implement Competition-Related Commitments Enshrined In Memoranda Of Understanding Aimed At Supporting The Economic Recovery”, May 2011, E-Competitions, N.º 37516.

“The Memorandum Of Understanding On Specific Economic And Competition Policy Conditionality For Granting Financial Assistance: Portuguese Point Of View”, with João E. Gata, May 2011, E-Competitions, N.º 37516.

PhD in Law, King’s College London (2018).

LL.M, Duke University (2004).

D.E.S. - Droit européen, Université Libre de Bruxelles - Intitut d’Études Européennes (2001).

Degree in Law, School of Law of the Portuguese Catholic University, Regional Centre of Oporto (1998).

Portuguese (mother tongue), English (fluent), French (fluent), Spanish (good).

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