John A. Trenor


Trenor, John A.

John A. Trenor is a partner in the firm's Litigation/Controversy Department, and a member of the International Arbitration Practice Group. He has a diverse international practice focusing on international arbitration and international litigation. Mr. Trenor has frequently worked on high-profile, complex matters involving negotiation with various government departments and agencies in the United States, Europe and other jurisdictions.


Mr. Trenor has represented companies, states, state-owned entities, international organizations, and individuals in a wide variety of disputes in the IT, telecommunications, oil and gas, financial services, pharmaceuticals, aviation, defense, and other industries. 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 and others, and regarding international litigation in national courts in the United States, Europe, and Asia. He has extensive experience in matters regarding public and private international law, including such areas as conflict of laws, extraterritoriality and jurisdiction, investment protection, state responsibility, reparations, territorial sovereignty, sovereign immunity, the law of treaties, and the law of the sea, as well as extensive experience in US constitutional questions regarding foreign affairs and foreign commerce.

He also advises clients on cross-border regulatory matters and is the Rapporteur of the ICC Task Force on Extraterritoriality.

He has published articles on a variety of international issues.

Honors & Awards

  • Recommended in the 2008, 2009, and 2010 editions of Legal 500 UK and the 2016 and 2017 editions of Legal 500 United States for dispute resolution: international arbitration

Publications & News


April 17, 2018

The Second Edition of Global Arbitration Review's The Guide to Damages in International Arbitration Has Been Published

We are delighted to announce the publication of The Guide to Damages in International Arbitration (Second Edition, Global Arbitration Review, 2018).

January 22, 2018

The Guide to Damages in International Arbitration: Introduction

The objective of The Guide to Damages in International Arbitration, published by Global Arbitration Review and edited by WilmerHale Partner John Trenor, is to help all participants in the international arbitration community—from the arbitrators to the parties to counsel and experts—understand damages issues more clearly and communicate those issues more effectively to tribunals to further the common objective of assisting arbitrators in rendering more accurate and well-reasoned awards on damages.

January 22, 2018

The Guide to Damages in International Arbitration: Strategic Issues in Employing and Deploying Damages Experts

This chapter, authored by WilmerHale Partner John Trenor and appearing in Global Arbitration Review's The Guide to Damages in International Arbitration, addresses a number of techniques and approaches that parties and their counsel, as well as tribunals, can consider to maximise the effectiveness of expert assistance on damages issues. It bears emphasis that the usefulness or appropriateness of a particular technique or approach depends significantly on the circumstances of the case at issue.

June 9, 2017

The Legal 500 United States 2017 Recognizes 125 WilmerHale Lawyers Across 28 Practice Areas

The Legal 500 United States has released its 2017 rankings, recommending 125 WilmerHale lawyers—including 12 who are named to its elite “Leading Lawyers” list and two on its “Next Generation Lawyers” list—and 28 practice areas in its 11th edition.

September 15, 2016

Gas Pricing Disputes Under Long-Term Gas Sales and Purchase Agreements

A chapter co-authored by John Trenor, published in the fifth edition of The Energy Regulation and Markets Review, explains some of the key elements often seen in long-term GSPAs (including price review mechanisms), some of the recent market developments that may have contributed to the substantial increase in gas price disputes, and some of the issues of contention between parties that may arise in these disputes. In addition, there are comments on the possible future of gas price dispute resolution.

June 22, 2016

The Legal 500 United States 2016 Recognizes 111 WilmerHale Lawyers Across 30 Practice Areas

The guide's rankings are based on a series of criteria, including client feedback, interviews with private practice lawyers, and its own research.

October 1, 2014

Revised LCIA Arbitration Rules

The London Court of International Arbitration (“LCIA”) has revised its international arbitration rules. The LCIA's revised rules, came into force on 1 October 2014.

February 12, 2013

Wilmer Cutler Pickering Hale and Dorr’s International Arbitration Group Honored by OGEMID

Wilmer Cutler Pickering Hale and Dorr LLP is delighted to announce the recognition of its International Arbitration Group in OGEMID’s 10th Anniversary Awards. Among other things, the group’s Intern Program was named the winner of the 10th Anniversary “Diversity” Award and its Scholar-in-Residence Program was voted runner-up for the “Creativity” Award.

September 21, 2012

Arbitration with Indian Parties Now More Predictable Following Landmark Indian Supreme Court Decision

September 13, 2011

Revised ICC Rules of Arbitration


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MPA, Princeton University, 1995

JD, with honors, University of Chicago Law School, 1995, Member, University of Chicago Law Review

BA, Cornell University, 1991

Bar Admissions

District of Columbia

New York



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