Tiago Duarte

Tiago Duarte

Joined PLMJ in 2004.
Partner in the Public Law practice.

About Tiago

Tiago is a partner in the Public Law practice and has more than 20 years’ experience in public law and arbitration. He is recognised as a lawyer, arbitrator and academic.

As a lawyer, Tiago specialises in administrative law. He is known for his work on major public-private partnership projects, in the public procurement stage, in implementing the contracts, and in administrative litigation and arbitration (domestic and international). Tiago has assisted private companies and public bodies in a range of matters, including their relationship with the Court of Auditors and the Constitutional Court.

As an arbitrator, he has extensive experience in domestic and international disputes (he was a sole arbitrator in an ICC arbitration). Tiago is also one of the four Portuguese arbitrators nominated by the Portuguese State to the International Centre for Settlement of Investment Disputes’ (ICSID) international panel of arbitrators. The ICSID is the most important investment arbitration centre in the world. Prior to this, Tiago, had already worked as a lawyer and legal expert in ICSID arbitrations.

As an academic, Tiago has a doctorate in public law from Universidade Nova de Lisboa. He is also a professor at the Faculty of Law of Universidade Católica Portuguesa, where he is responsible for the subjects of constitutional law and international investment arbitration. Tiago is also a guest lecturer at other universities and a speaker on a variety of postgraduate courses.

He has carried out research and published writings in the areas of constitutional law, administrative law, public finances and international investment protection arbitration. Tiago was also a Visiting Fellow at the University of Cambridge (Lauterpacht Research Centre for International Law and Wolfson College).


English, Spanish, French, Italian

Academic Background
  • Degree in Law, Universidade de Lisboa Law School, 1995
  • Admitted to the Portuguese Bar Association, 1997
  • PhD in Public Law, Nova University Law School, with a dissertation entitled "The Law behind the Budget - The constitutional issue of the Budget Law", 2005
  • Law Professor, Nova University Law School, since 2006
  • Lecturer in the PhD Program in ISCTEM University in Mozambique (2008)
  • “Visiting Fellow" at University of Cambridge (Lauterpacht Research Centre for International Law and Wolfson College), (2011-2012)
  • Lecturer in post-graduate courses related to international investment arbitration, Universidade do Minho Law School, Lisbon University Law School, Nova University Law School
  • Professor of Constitutional Law and Administrative Law at Nova University Law School, since 2006
Professional Background
  • Partner at PLMJ since 2008
  • Legal Advisor of the Deputy Minister for the Ministers Council (1995-1997)
  • Consultant to the Legal Policy and Planning Department of the Justice Ministry (2001-2002)
  • Chief of Staff of the Deputy Economy Minister (2003-2004)
  • Arbitrator in domestic and ICC arbitrations and member of the panel of arbitrators of the Arbitration Centre of the Lisbon Commercial Association and the Administrative Arbitration Centre (CAAD)
  • Chairman of the International Investment Arbitration Committee of the APA - Portuguese Arbitration Association
Member of
  • Member of the National Council of Ethics for the Life Sciences (Conselho Nacional de Ética para as Ciências da Vida), elected by the Portuguese Parliament
The Legal 500
2022 - Tiago Duarte | Public Law
2021 - Tiago Duarte | Public Law
2020 - Tiago Duarte | Public Law
2019 - Tiago Duarte | Public Law
2018 - Tiago Duarte | Public Law
2017 - Tiago Duarte | Public Law
Who's Who Legal
2021 - Tiago Duarte, Iberia National Leader | Government Contracts
2020 - Tiago Duarte, Global Leader | Government Contracts
2019 - Tiago Duarte, Global Leader | Government Contracts
Best Lawyers
2022 - Tiago Duarte | Recommended Lawyers
2021 - Tiago Duarte | Recommended Lawyers
2019 - Tiago Duarte | Recommended Lawyers
2018 - Tiago Duarte | Recommended Lawyers
2017 - Tiago Duarte | Recommended Lawyers
2016 - Tiago Duarte | Other Recommended Lawyer
Chambers Europe
2022 - Tiago Duarte, Band 2 | Public & Administrative Law
2021 - Tiago Duarte, Band 2 | Public & Administrative Law
2020 - Tiago Duarte, Band 2 | Public & Administrative Law

"Clients depict his work as "practical and solid"."

2019 - Tiago Duarte, Band 2 | Public & Administrative Law

"He advises a broad array of clients, including concessionaires, public organisations and industry associations."

2018 - Tiago Duarte, Band 2 | Public & Administrative Law

"He is recognised for his exceptional technical knowledge, availability and good ability to find alternative solutions."

2017 - Tiago Duarte, Band 2 | Public & Administrative Law

"Tiago Duarte continues to be a well-reputed figure in the Portuguese public law arena for his professional and academic background."

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