Tiffany Rider represents clients in criminal antitrust cartel investigations, as well as on the antitrust aspects of particularly complex mergers and acquisitions.


Within Ms. Rider’s criminal defense representations, she has experience in internal corporate investigations, U.S. grand jury proceedings, federal court proceedings, and U.S. and international leniency programs. She has defended companies and individuals in prominent international cartel cases and dealt with the U.S. Department of Justice, the European Commission, the Canadian Competition Bureau, the Australian Competition and Consumer Commission and other enforcement agencies around the world. For example, on behalf of clients facing criminal charges, Ms. Rider has:

  • assisted companies and individuals through grand jury proceedings;
  • obtained leniency in multiple jurisdictions;
  • achieved early closure of a criminal investigation by the Department of Justice; and
  • negotiated reductions in fines, including a post-judgment fine reduction.

Related to her criminal defense work, Ms. Rider has represented clients in follow-on antitrust class action litigation and arbitration. She also designs and implements comprehensive international corporate antitrust compliance programs tailored to specific industries.

Additionally, Ms. Rider has represented clients on a number of high-profile mergers and acquisitions, including:

  • CME in its joint venture of the Dow Jones Indexes with S&P;
  • Sprint in its opposition to AT&T’s proposed acquisition of T-Mobile. This case was recognized in the 2012 Financial Times “US Innovative Lawyers” report; and;
  • BHP Billiton in its proposed $150 billion acquisition of Rio Tinto (received Department of Justice clearance).

Ms. Rider was selected for inclusion in Chambers USA: America’s Leading Lawyers for Business 2018. She speaks on panels regarding international competition developments, including follow-on European litigation. She also is currently a vice chair of the ABA Antitrust Section’s Civil Practice and Procedure Committee.


Speaking Engagements

“Careers In International Antitrust Law and Economic Consulting,” ABA, George Mason University School of Law (March 9, 2016)

“Leniency Applications in Multi-Jurisdictional Antitrust Cases,” Fordham University (February 11, 2016)

“Through the Looking Glass: When ‘Direct’ Means ‘Indirect,’” ABA Antitrust Spring Meeting (April 15, 2015)

“FTAIA Update: How Direct is “Direct”?” Section of Antitrust Law, ABA (May 14, 2014)

“Sharing is Daring: Information Exchanges Around the Globe,” ABA Antitrust Spring Meeting (March 2014)

International Cartel Workshop, Section of Antitrust Law, ABA (February 2014)

“Private Antitrust Damage Actions,” Section of Antitrust Law, ABA (July 23, 2013)

“Litigation Wave Crosses the Pond: What are the Ripples?” ABA Antitrust Spring Meeting (April 2013)

“2011 Year-End Review of FTAIA Cases: Is the Pendulum Swinging Back Towards the Plaintiffs?” Section of Antitrust Law, ABA (January 27, 2012)



  • J.D., Indiana University School of Law, 2002
  • B.S., University of California, Los Angeles, 1992


  • District of Columbia
  • Indiana
  • United States District Court for the Eastern District of Michigan

Tiffany Rider