TEL:+44 (0)20 7071 4231
FAX:+44 (0)20 7070 9231
Telephone House, 2-4 Temple Avenue, London, EC4Y 0HB United Kingdom
Jeffrey Sullivan is a partner in the International Arbitration Group. He specialises in both commercial and investment treaty arbitration, as well as all aspects of public international law.
Jeff’s practice has a particular focus on disputes arising in the energy, extractive industries and infrastructure sectors. His experience includes handling disputes arising out of long-term supply agreements, concession agreements, production sharing and operating agreements, joint venture agreements, EPC and other construction agreements.
Jeff has also acted as counsel and lead advocate in numerous bilateral investment treaty and Energy Charter Treaty arbitrations. He has also appeared in numerous ICSID annulment proceedings. He has advised States in Europe, Central Asia and the Middle East on the negotiation and drafting of trade and investment treaties. Jeff also regularly advises clients on the structuring of foreign direct investments and issues of state succession.
The author of numerous academic articles and chapters on international investment law and arbitration, Jeff is frequently invited to speak at international conferences and seminars. Among other positions, Jeff is, an advisory board member of the Institute for Transnational Arbitration, a member of the Energy Charter Treaty Secretariat’s Legal Advisory Task Force, and sits on the Executive Board of the European Federation for Investment Law and Arbitration and the Executive Committee of the Foundation for International Arbitration Advocacy.
Jeff is a dual-qualified lawyer, admitted to practice in Washington DC and England & Wales.
He is consistently ranked as a leading individual by the major legal directories, including Chambers & Partners and Legal 500. Recent commentary includes:
“He was very communicative and very thorough, with a knowledge of arbitration that was second to none” Chambers UK 2019 (Public International Law)
“He is a consummate professional and has an unbelievable command over his cases” Chambers UK 2019 (International Arbitration: Investor-State)
“Jeff has always displayed an excellent tactical mind, a high level of client commitment and an impressive ability to grasp complicated, nuanced matters very quickly” Chambers UK 2018 (Public International Law and International Arbitration)
“Jeff is “a ‘rising star’ and ‘genuine specialist’ in PIL. He possesses particular experience advising on investment treaty disputes, and heads the firm’s PIL group” Chambers Global 2016 (Public International Law)
“Team leader Jeffrey Sullivan is a well-known figure in the London PIL market, with substantial expertise in handling investment treaty disputes and ECT claims. He counts both states and commercial entities as clients, frequently representing them before international tribunals. Peers deem him a ‘genuine specialist’ in PIL.” Chambers UK 2016 (Public International Law)
Chambers 2015 records that clients “praise practice leader Jeffrey Sullivan for his persuasive, solution-oriented practice and ability to ‘put pressure on the other side tactically in enormously complicated disputes.’ …” (UK – Public International Law)
* Includes experience prior to joining Gibson Dunn
Selected published work
University College London - 2006 Master of Laws (LL.M.)
University of Florida - 1999 Juris Doctor
University of Florida - 1996 Bachelor of Arts
District of Columbia Bar
England & Wales - Solicitor