Heather S. Tewksbury



Heather Tewksbury is a well-regarded lawyer and trusted advisor who has established a premier practice representing companies and individuals in government investigations and related litigation throughout the United States and abroad. Ms. Tewksbury leads WilmerHale's California Cartel Enforcement Practice, part of the firm's internationally recognized Antitrust and Competition Group. She has represented multinational corporations and executives in cross-border criminal and civil antitrust investigations and litigation, and brings her unique experience and insight to cartel investigations and to the workings of the antitrust agencies that are most actively involved in cartel enforcement.

Ms. Tewksbury is also recognized for her trial work. She was included in the Diversity Journal's 2017 “Women Worth Watching” list, recognized as one of the Top Women Lawyers by the Daily Journal in 2014 and 2016, and named Litigator of the Week by GCR USA for her defense work in 2014. She is also consistently recognized as a highly regarded lawyer by Chambers USAChambers Global and The Legal 500 United StatesChambers USA describes Ms. Tewksbury as a “criminal antitrust expert” and “very talented trial lawyer” who is “absolutely brilliant” and knows “how the antitrust division thinks.”

Ms. Tewksbury is active throughout the broader legal community. She is a Fellow of the Litigation Counsel of America – Trial Lawyer Honorary Society, and serves in the leadership of the Antitrust Section of the American Bar Association. She also currently serves as vice chair of the California State Bar's Antitrust and Unfair Competition Section Executive Committee, and participates as a speaker or moderator on numerous panel discussions sponsored by notable thought leadership organizations, such as the American Bar Association, GCR Live, Practicing Law Institute, Golden State Institute and the National Institute on White Collar Crime. Ms. Tewksbury served for two years as editor-in-chief of the Journal of Competition, which is published by the California State Bar and Westlaw.

Ms. Tewksbury joined the firm in 2014 after serving as a trial attorney in the Antitrust Division of the US Department of Justice (DOJ) in San Francisco, where she handled some of the most significant investigations and criminal prosecutions brought by the agency in recent years. Most notably, she served as one of the lead trial lawyers in United States v. AU Optronics Corporation, a case with seven defendants (two corporations and five executives) involving price-fixing in the LCD industry. After that trial, Ms. Tewksbury led the sentencing of the corporations, which resulted in a record $500 million fine and the first-ever appointment of a corporate compliance monitor in a contested sentencing. She also served as lead trial counsel in the jury trials of two AU Optronics executives.

Ms. Tewksbury began her career as an attorney at a major Bay Area law firm, where she practiced intellectual property and complex civil litigation. 

Honors & Awards

Speaking Engagements

  • Moderator, "Enforcement Issues and Opportunities for Antitrust Practitioners," PLI's Antitrust Institute 2017: Developments & Hot Topics, 2017
  • Panelist, "Using Antitrust Convicts in Antitrust Compliance Program," ABA Section of Antitrust Law Spring Meeting, 2017
  • Moderator, "Dealing with Enforcement Issues and Opportunities," PLI's Antitrust Institute 2016: Developments & Hot Topics, 2016
  • Chair and Moderator, "From Dawn Raid to a Negotiated Plea," ABA Section of Antitrust Law Spring Meeting, 2016
  • Panelist, "Does Gender Matter in Antitrust Law? Tips from Experienced Practitioners in Private Practice, Government and In-house Roles on How to Survive and Thrive in Your Antitrust Practice," The State Bar of California Antitrust and Privacy Section Webinar, 2016
  • Panelist, "Cross-Examination; Trial Objections," PLI's California Trial Advocacy, 2016
  • Panelist, "Dealing with Enforcement Issues and Opportunities," PLI's Antitrust Institute 2016: Developments & Hot Topics, 2016
  • Panelist, "Antitrust Prosecution Trends," 30th Annual National Institute on White Collar Crime, 2016
  • Moderator, "Did the enforcers go bananas in Dole v. Commission? What are the boundaries of cartel conduct and why does it matter?" GCR Live Cartels Conference, 2016
  • Co-Chair, Fall Forum, ABA Section of Antitrust Law, 2015
  • Panelist, "FTAIA Practice and Problems," ABA Section of Antitrust Law, 2015
  • Panelist, "Preparing for an Antitrust Trial as an Associate," ABA Section of Antitrust Law, 2015
  • Debater, "An Oxford Union-style debate – The new world of global civil litigation: is the US a model or cautionary tale?" GCR Live Antitrust Litigation USA, 2015

Publications & News


March 16, 2018

WilmerHale Recognized for Outstanding International Lawyers and Practices in Chambers Global 2018

In the 2018 edition of Chambers Global, 33 WilmerHale lawyers were named among “The World's Leading Lawyers for Business."

August 24, 2017

Heather Tewksbury Honored Among Diversity Journal's Women Worth Watching

The Diversity Journal has recognized Partner Heather Tewksbury on its annual list of Women Worth Watching, which honors executive trailblazers for their passion, potential, and positive influence both inside and outside the workplace.

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.

May 26, 2017

WilmerHale Lawyers and Practices Recognized in 2017 Edition of Chambers USA

Chambers and Partners announced its rankings for the 2017 edition of Chambers USA: America's Leading Lawyers for Business, with WilmerHale listed among the nation's best in 50 practice area categories. Chambers also ranked 86 WilmerHale lawyers as leaders in their respective fields.

March 21, 2017

WilmerHale Recognized for Outstanding International Lawyers and Practices in Chambers Global 2017

Chambers Global has named 27 WilmerHale lawyers among "The World's Leading Lawyers for Business" in its 2017 edition.

February 6, 2017

SEC Dismisses Claims Against WilmerHale Clients

On February 3, the US Securities and Exchange Commission dismissed with prejudice the remaining claims against two former mortgage-lending officials in a financial crisis-related lawsuit on the eve of a retrial.

December 15, 2016

WilmerHale Partners Molly Boast and Heather Tewksbury Named Top Women in Antitrust Law by GCR

Partners Molly Boast and Heather Tewksbury have been named to Global Competition Review's (GCR) list of top Women in Antitrust 2016.

November 7, 2016

FTC/DOJ Guidance to Human Resource Professionals—Enforcement Scrutiny of Employment-Related Conduct

Last month, the Federal Trade Commission and Department of Justice issued their Antitrust Guidance for Human Resource Professionals. This WilmerHale Client Alert, which was also published by Bloomberg BNA's Antitrust & Trade Regulation Report on November 25, 2016, summarizes the key lessons and practical impact from the HR Guidance for businesses' employment practices.

October 3, 2016

SEC Drops Centerpiece Of Case Against WilmerHale Clients

WilmerHale recently achieved a major victory after the US Securities and Exchange Commission (SEC) dropped the centerpiece of its lawsuit against two former mortgage executives.

July 12, 2016

WilmerHale Attorneys Fend Off SEC Claims in Fraud Trial

The Recorder discusses the first SEC defeat in 2016, detailing the case led by Heather Tewksbury and Randall Lee.


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JD, University of California, Berkeley School of Law, 2002, Executive Editor, Ecology Law Quarterly, Member, Berkeley Law & Technology Journal

BA, Political Science, University of California, Berkeley, 1997, Golden Key Honor Society

Bar Admissions


Government Experience

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