Lawyers

Thomas Sebastian

Thomas Sebastian

Position

Thomas acts in complex regulatory and commercial disputes.

His practice is diverse and spans public international law (in particular, WTO law and investment treaty law); international arbitration; commercial litigation and competition law.

Recent case highlights include acting for Google in its dispute with Epic Games; acting for the United Kingdom in defending a €2.7 billion infraction action brought before the CJEU and defending MUFG in collective proceedings brought in the CAT in connection with alleged manipulation in the FX markets.

Thomas has acted at all levels of the English courts.  He has also acted internationally before a wide variety of international tribunals (including the WTO’s Appellate Body, WTO panels, the CJEU and ICSID tribunals).

Thomas takes a collaborative approach to his cases and is particularly well-versed in handling disputes which involve economic or regulatory issues.

He is a member of the “A Panel” of Junior Counsel to the Crown (Attorney General’s Public International Law Panel).

Career

2023 onwards: Essex Court Chambers, London 2012-2023: Monckton Chambers, London 2010-2012: Allen & Overy LLP, London 2002-2009: Advisory Centre on WTO Law, Geneva

Mentions

Asia Pacific: The English Bar

Commercial

Leading junior2
Thomas Sebastian - Essex Court Chambers
London Bar

Competition

Leading junior3
Thomas Sebastian – Essex Court Chambers 'Thomas has strong forensic drafting skills and a very broad knowledge of competition law and its application to commercial agreements.'
London Bar

International arbitration: counsel

Leading junior2
Thomas Sebastian – Essex Court Chambers 'Tom is superb, calm and leads management of a difficult case as well as can be imagined. High intelligent and incisive. Keen mind for the commercial realities in a case.'
London Bar

Public international law

Leading junior3
Thomas Sebastian – Essex Court Chambers ‘One of the most insightful minds at the Bar in my view. Enormously intelligent but wears it lightly. Diligent, super smart and an all-round class act.’