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Twenty Essex

Work 020 7842 1200
Fax 020 7842 1270
London, Singapore

Guglielmo Verdirame QC

Work 020 7842 1200
Twenty Essex (Twenty Essex)

Work Department

  • Constitutional public and human rights law
  • Energy and natural resources
  • International arbitration
  • Public international law


Guglielmo acts as counsel in cases before English courts, international courts and tribunals. His cases have involved the full breadth of public international law including investment law, treaty interpretation, immunities and privileges, trade, human rights, law of armed conflict and national security, and boundary disputes.

He has an extensive practice in investment treaty arbitration. Guglielmo regularly acts as counsel, more often in a leading capacity, for both investors and states.

Guglielmo is a member of the UK Attorney General’s A Panel of Counsel in Public International Law. In this capacity, he has been instructed to appear before the International Court of Justice (ICJ), UK Supreme Court and Court of Appeal. Guglielmo was, for example, the public international law specialist in a team of five counsel selected by the UK government for the “Article 50 case” brought by Gina Miller in the aftermath of the Brexit referendum.

He is Professor of International Law at King’s College London (part-time). Guglielmo has published extensively in the areas of public international law, international arbitration, and comparative public law.


Professor of International Law (from July 2011), King’s College London; university lecturer University of Cambridge 2003-11; Fellow, Lauterpacht Centre for International Law, 2003-11; visiting professor fellow, Harvard Law School 2007; fellow Merton College, Oxford 2000-03; called to the bar 2006. Publications of notes: ‘UN and Human Rights: Who Guards the Guardians’ (Cambridge University Press, 2011); Rights in Exile (Berghahn Books, 2005); some articles and chapters include (with M Jorek) ‘Reparation in Investment Arbitration’ forthcoming in truck and Aliyev (eds.) Settlement of Disputes with Countries in Transaction (to be published also in Russian); ‘Human Rights in War: A Framework for Analysis’, [2008] European Human Right s Law Review 6:689-705; ‘“The Divided West”: American and European International Lawyers’, 18(2) European Journal of International law (2007) 553-580; ‘The Sinews of Peace: International Law, Strategy and the Prevention of War’, 78 British Year Book of International law (2206) 83-162.


Italian (fluent); French (proficient); German (proficient); Modern Hebrew (conversational)


  • American Society of International Law
  • Attorney General’s Public International Law A Panel
  • British Institute of International and Comparative Law
  • Commercial Bar Association
  • European Society of International Law
  • International Law Association


  • London School of Economics and Political Science: PhD (2001)
  • University of Oxford: MA – titular only (2001)
  • University of London: LLM (1995)
  • University of Bologna: Laurea in Giurisprudenza – magna cum laude (1994)

London Bar

Public international law

Within: Public international law – 2019 silks

Guglielmo Verdirame QC - Twenty EssexParticularly good in the practical application of PIL in novel commercial situations.

Within: Public international law

Twenty Essex has a stellar reputation for public international law, fielding some highly experienced barristers at both senior and junior levels. Members have been involved in a broad range of headline cases with major international law issues. Notable highlights included Guglielmo Verdirame’s instruction as part of the attorney general’s team in Miller v Secretary of State for Exiting the European Union, Sir Michael Wood KCMG’s involvement in the Australia v Timor-Leste conciliation, as well as Sir Daniel Bethlehem KCMG QC leading a team in the ‘Enrica Lexie’ incident (Italy v India).

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