Thomas Mueller


Chair, Antitrust and Competition Practice Group

Mueller, Thomas

Thomas Mueller is chair of WilmerHale's Antitrust and Competition Practice Group. He joined the firm in 1992.

Mr. Mueller's antitrust practice focuses on global cartel enforcement matters, as well as merger and other investigations with transatlantic implications. Having practiced both in Brussels and Washington, Mr. Mueller has insight into antitrust issues on both sides of the Atlantic and has helped steer clients through the difficulties and opportunities created by the closer cooperation between the US and EU authorities. Chambers describes him as "a figure of great stature within criminal and cartel investigation circles" and "a creative strategist, which makes him a perfect choice for this often complicated and rapidly moving area."


Cartel Investigations and Litigation
Mr. Mueller has extensive internal investigation and litigation experience. His experience in both the US and Europe has been helpful in developing strategies in responding to price-fixing allegations, often from multiple antitrust authorities around the world. He has successfully persuaded authorities to close investigations without taking enforcement action and has secured non-prosecution agreements and leniency protection for clients. A selection of recent cartel investigations and litigation matters include:

  • Representing a Japanese capacitor manufacturer in the DOJ’s investigation of that industry
  • Representing the leading North Sea oil and gas producer in the FTC’s investigation related to the Brent Crude index
  • Representing a major natural gas company in DOJ and State AG investigations of leasing practices
  • Representing one of the world's largest auto parts manufacturers in resolving its criminal liability in the US
  • Representing a leading bearing manufacturer in the DOJ's investigation of that industry
  • Representing CSAV in the DOJ’s investigation of automobile ocean shipping
  • Representing a major European airline in investigations and litigation concerning the air cargo business
  • Representing JP Morgan Chase in the DOJ's investigation of the municipal derivatives market
  • Representing a major Japanese freight forwarder in DOJ investigations of the logistics industry
  • Representing Chi Mei Optoelectronics in the LCD investigation
  • Representing Odfjell ASA in the investigation by the US and EU of an alleged conspiracy among major chemical tanker companies
  • Representing a major private equity fund regarding the conduct of a portfolio company
  • Representing the lead euro dollar trader of a major US bank in the foreign exchange investigation
  • Representing a head of sales in an auto parts investigation
  • Representing the head of rates at a major bank in the LIBOR investigation

Merger Clearance
Mr. Mueller has represented clients in numerous in-depth investigations of global transactions, including serving as lead EU counsel in the merger between America Online and Time Warner, at the time, the world's largest merger. He has obtained early conclusion of phase II cases before the European Commission, as well as the clearance by US and EU authorities of Tetra Laval's acquisition of Sidel—the only transaction to have been successfully appealed and then approved by the European Commission.

Conduct Investigations and Counseling
Mr. Mueller counsels clients in a wide variety of industries on issues of abuse of dominance and vertical and horizontal restrictions of competition. He has particular experience in the logistics, energy, manufacturing, finance and tech industries.  

Honors & Awards

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."

September 27, 2017

The National Law Journal Recognizes Thomas Mueller as an Antitrust Trailblazer

Mueller was chosen based on his significant career accomplishments and innovations in the field of antitrust and competition law.

August 16, 2017

WilmerHale Lawyers Named Among the 2018 Best Lawyers in America®, Nine Recognized as Lawyers of the Year

Best Lawyers in America®—the oldest and most respected peer-review publication in the legal industry—recognizes 107 WilmerHale lawyers and names nine partners as Lawyers of the Year in its 24th edition.

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 30, 2017

WilmerHale Wins Two Global Competition Review Awards

The firm received the Litigation of the Year – Cartel Defence award for its representation of Denso and the Litigation of the Year – Cartel Prosecution award for its representation of candy-maker Katjes.

March 28, 2017

Cautious about Collaboration: Antitrust Scrutiny in Oil and Gas Exploration

This article by Thomas Mueller and Nana Wilberforce was shared at the 64th Spring Meeting of the ABA Section of Antitrust Law, which took place in March 2017.

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.

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.

August 15, 2016

WilmerHale Lawyers Named Among the 2017 Best Lawyers in America®, Six Recognized as Lawyers of the Year

Best Lawyers in America®—a respected peer-review publication in the legal industry—recognizes 101 WilmerHale lawyers and names six partners as Lawyers of the Year in its 23rd edition.

Professional Activities

Mr. Mueller is a member of the International Cartel Task Force in the American Bar Association's Section of Antitrust Law. He has also served as an adjunct professor at Georgetown University Law Center where he taught a course on comparative US and EU competition law.




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JD, cum laude, Harvard Law School, 1990

BA, magna cum laude, Williams College, 1987

Bar Admissions

District of Columbia


New York

Brussels (associate member)





The Hon. Walter J. Skinner, US District Court for the District of Massachusetts, 1990 - 1991

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