Associate Professor of Keio University Law School


Ariel TREHEARNE has been an Associate Professor at Keio University Law School since April 2017 and has lectured at Keio University Law School since April 2014. His research interests include the regulation of multinational corporations, investor-state dispute settlement, cross-border dispute resolution, public international law, and water law. Professor Trehearne previously worked as a corporate associate at a global law firm's Calgary (Canada) office and today is a dispute resolution lawyer at Herbert Smith Freehills in Tokyo. He qualified as a barrister and solicitor in the Province of Alberta (Canada) in 2012 and has experience of litigation, arbitration, corporate law, securities law, and public international law.

◆Fields of Expertise  

• Investor-State Dispute Settlement
• International Commercial Arbitration
• Public International Law
• Multinational Corporations


a. The Continental Shelf (Chapter 6 of The IMLI Manual on International Maritime Law, Volume 1: The Law of the Sea - co-author Dominic Roughton);

b. Careful Balance or Missed Opportunity? The 'In Principle' Public Nature of the Arbitration Concerning the "Enrica Lexie" Incident, Kluwer Arbitration Blog;

c. The Challenge of Sanctions for Arbitral Participants, Kluwer Arbitration Blog (co-author Christopher Hunt);

d. Japan in the Pacific Century: Opportunities and Challenges arising from the TPP (TDM 1, 2015 - co-author Christopher Hunt)

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