John A. Trenor is a partner in the firm's Litigation/Controversy Department, and a member of the International Arbitration Practice Group. 

Mr. Trenor is an international dispute resolution lawyer with almost 25 years of experience in international arbitration and cross-border disputes. Mr. Trenor represents clients in international arbitrations sited around the world, in disputes governed by both civil law and common law, as well as public international law and international investment law. He has advised clients regarding commercial, investor-state and state-to-state arbitrations under virtually all of the major institutional as well as ad hoc rules, including ICC, LCIA, AAA, SCC, VIAC, UNCITRAL, ICSID, UNCITRAL and others.

Mr. Trenor has represented companies, States, State-owned entities, international organizations and individuals in a wide variety of disputes in the aviation, defense, energy, financial services, pharmaceuticals, technology, telecommunications and other industries. He has significant recent experience in a range of oil and gas disputes and gas price review arbitrations in particular.  

Mr. Trenor has frequently worked on high-profile, complex matters involving negotiation with various government departments and agencies in Europe, the United States and other jurisdictions. He also advises clients on cross-border regulatory matters.

He is the editor and co-author of the book The Guide to Damages in International Arbitration, published by Global Arbitration Review, now in its third edition. He has also published on a variety of other international topics.

Mr. Trenor teaches a course on international arbitration at Georgetown University Law Center.

  • Contractual Performance and COVID-19 – An In-depth Comparative Law Analysis

    WilmerHale and Wolters Kluwer are delighted to launch a new and in-depth comparative legal analysis of the impact of the pandemic on contractual performance in key civil and common law jurisdictions. The site examines whether and under what circumstances COVID-19-related impediments may excuse contractual performance or lead to modification or termination; and addresses a wide variety of legal concepts, such as impossibility, impracticability, frustration of purpose, force majeure, hardship or imprévision, and clausula rebus sic stantibus.

    Read More
  • Strategies for Mitigating Corporate Risk as the Coronavirus (COVID-19) Outbreak Unfolds

    WilmerHale task force members Partners Douglas Burton, Meredith Cross, Kirk Nahra, Peggy Otum and John Trenor and Counsel Andrew Stauber joined Alejandro Mayorkas for the webinar. This panel, which represents a wide array of legal disciplines implicated by the outbreak, discussed how companies can develop and execute the legal and operational plans needed to navigate these evolving challenges.

    March 5, 2020
    Read More
  • Navigating Force Majeure Clauses and Related Doctrines in Light of the COVID-19 Pandemic

    Partner John Trenor and Associate Hyun-Soo Lim co-authored this article which addresses some of the contractual issues that companies are facing in deciding whether force majeure or other clauses in their contracts–or other related doctrines under the governing law–may excuse them or their counterparties from the performance of contractual obligations in light of the impact of the pandemic. Read the full article published by Young Arbitration Review

    Read More


  • Recommended in the 2008, 2009 and 2010 editions of Legal 500 UK and the 20162017 and 2018 editions of Legal 500 United States for dispute resolution: international arbitration
  • Named to the Lawdragon 500 Global Leading Litigators list, which recognizes lawyers who specialize in international arbitration, public international litigation and global controversies.

Insights & News


  • Education

    • MPA, Princeton University, 1995

    • JD, University of Chicago Law School, 1995

      with honors Member, University of Chicago Law Review
    • BA, Cornell University, 1991

  • Admissions

    • District of Columbia

    • England and Wales, Registered Foreign Lawyer

    • New York

  • Languages

    • French



Unless you are an existing client, before communicating with WilmerHale by e-mail (or otherwise), please read the Disclaimer referenced by this link.(The Disclaimer is also accessible from the opening of this website). As noted therein, until you have received from us a written statement that we represent you in a particular manner (an "engagement letter") you should not send to us any confidential information about any such matter. After we have undertaken representation of you concerning a matter, you will be our client, and we may thereafter exchange confidential information freely.

Thank you for your interest in WilmerHale.