Guglielmo Verdirame KC > Twenty Essex > London, England > Lawyer Profile

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)

Lawyer Rankings

London Bar > Public international law

(Leading Silks)Ranked: Tier 3

Guglielmo Verdirame KCTwenty Essex ‘He explains matters so clearly, is brilliant with clients and has the brain the size of a planet. He is a persuasive advocate and just a class act.’

London Bar > International arbitration: counsel

(Leading Silks)Ranked: Tier 4

Guglielmo Verdirame KC – Twenty Essex ‘Highly knowledgeable and incredibly persuasive as an advocate.’

Twenty Essex is a ‘leading, go-to set in commercial and investment treaty arbitration‘  with ‘great strength in depth amongst juniors and silks‘. The members have wide-ranging expertise in a range of issues, from traditional strengths in shipping, commodities and insurance, through to multi-jurisdictional fraud disputes and cases with public international law elements. Members regularly work together, and recently Charles Kimmins KC led Mark Tushingham  in a US$134m UNCITRAL arbitration concerning the supply of power turbines to an African state. Guglielmo Verdirame KC is leading Belinda McRae, among others, on behalf of the Republic of Poland in Invenergy v Republic of Poland, a BIT dispute concerning a US$700m investment into the country’s wind energy sector.