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 23, 2016

Chambers Global 2016 Ranks WilmerHale Lawyers, Practices

Chambers Global has named 28 WilmerHale lawyers among “The World's Leading Lawyers for Business” in its 2016 edition. Additionally, the firm is ranked in 15 practice areas that span five regions.

May 19, 2015

WilmerHale Practices, Lawyers Ranked Among Nation’s Best by Chambers USA

Chambers USA: America's Leading Lawyers for Business announced its final rankings for the 2015 edition, with WilmerHale ranking among the nation's best in 46 practice area categories. Chambers also ranked 86 WilmerHale attorneys as leaders in their respective fields.

March 17, 2015

WilmerHale Partners to Present at 2015 ABA Section of Antitrust Law Spring Meeting

WilmerHale Antitrust and Competition partners are among the panel participants at the 63rd ABA Section of Antitrust Law Spring Meeting that will be held April 15-17, 2015 at the JW Marriott Hotel in Washington DC.

March 12, 2015

WilmerHale Lawyers, Practices Recognized in 2015 Edition of Chambers Global

Thirty-two WilmerHale lawyers are named among "The World's Leading Lawyers for Business" in the 2015 edition of Chambers Global. In addition to these individual accolades, the firm is recognized in 17 practice areas that span six different regions.

April 25, 2014

WilmerHale Attorneys Recognized in Annual Washington DC Super Lawyers Listing

The annual edition of the Washington DC Super Lawyers magazine, published by The Washington Post Magazine, released its 2014 listing which includes 37 WilmerHale attorneys.

March 14, 2014

Chambers & Partners Recognizes WilmerHale in its 2014 Global Edition

Thirty-one WilmerHale lawyers have been named among the “World’s Leading Lawyers for Business” in the 2014 edition of Chambers Global. In addition to these individual accolades, 13 of the firm’s practice areas were also recognized.

December 2, 2013

Washingtonian Magazine Names 14 WilmerHale Attorneys to "Best Lawyers" List

May 24, 2013

Chambers USA 2013 Final Results Announced

Chambers USA: America's Leading Lawyers for Business today announced its final rankings for the 2013 edition, in which 93 WilmerHale lawyers and 44 firm practice areas have been recognized as leading in their field.

May 21, 2013

WilmerHale Antitrust Attorneys Listed in International Who’s Who of Competition Lawyers and Economists 2013

Eleven WilmerHale antitrust attorneys were recently named to the International Who’s Who of Competition Lawyers and Economists 2013 listing.

April 10, 2013

Four WilmerHale Partners to Speak at 2013 ABA Section of Antitrust Law Spring Meeting

Four WilmerHale partners have been invited to speak on panels during the 61st ABA Section of Antitrust Law Spring Meeting, which will be held April 10-12 at the JW Marriott Hotel in Washington DC.

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