Gaëtan is a founding partner of Three Crowns. He has served as advocate and as arbitrator in a large number of both commercial and investment treaty arbitrations.

Gaëtan is a past Senior Co-Chair of the Arbitration Committee of the International Bar Association – a leading standard-setter for the practice of international arbitration. He is a member of the SIAC Court of Arbitration and was appointed to the ICSID Panel of Arbitrators by the Kingdom of Belgium. He teaches investment treaty law at King’s College School of Law in London.

Before entering private practice, he served as a Legal Advisor at the World Trade Organization in Geneva, where he advised dispute settlement panels adjudicating disputes between sovereigns across a range of industry sectors.

Gaëtan has been ranked as a leading international arbitration practitioner in all major publications, including Chambers, The Legal 500, The Legal 500’s Arbitration Powerlist 2019, and Who’s Who Legal.  Gaëtan has been described in Chambers as having “a phenomenal reputation” and is praised for “articulating his arguments well and being good at devising the right legal strategy while also convincing the tribunal during his submissions”. Who’s Who Legal has noted that Gaëtan is recognised by his clients, peers, and opponents as “the number-one person I have ever encountered on the other side,” “impressive and thorough oral advocate,” and “impressive in every aspect,” and that “he is liked by peers for his style and presence; he definitely deserves to be on any list of the best.”

Gaëtan is admitted to practice in England & Wales, France, and Spain. He was educated at Columbia Law School, the Johns Hopkins University School of Advanced International Studies, and the Catholic University of Leuven.