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ProfessionalsEyitayo “Tee” St. Matthew-Daniel

Eyitayo “Tee”  St. Matthew-Daniel

Tel: +1-212-373-3229
Fax: +1-212-492-0229

Tel: +1-212-373-3229
New York

1285 Avenue of the Americas
New York, NY 10019-6064
Fax: +1-212-492-0229


20 Air Street
London, United Kingdom W1B 5AN

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Bar Admissions 

An experienced antitrust counselor and litigator, Eyitayo “Tee” St. Matthew-Daniel is a partner in the Litigation Department and Deputy Co-Chair of the Antitrust Practice Group. Tee advises clients on a broad range of antitrust issues, including those impacting their interests and operations around the world, leveraging her experience within the senior ranks of the U.S. Department of Justice’s Antitrust Division and in private practice. She has represented global clients before the Antitrust Division, the Federal Trade Commission and the European Commission. Tee was recently recognized as a 2023 Law360 “Rising Star” for Competition.


As assistant chief in the DOJ’s Antitrust Division (April 2020–October 2022), Tee supervised and prosecuted matters related to enforcement priorities, such as international cartel and labor enforcement. She worked closely with the Division’s Front Office to implement substantial updates to the leniency policy and served as acting director of the Procurement Collusion Strike Force (February 2020–November 2020), leading a coordinated interagency response to antitrust crimes in public procurement, grant and program funding. Earlier, Tee served as counsel to the Division’s Assistant Attorney General (2019–2020), where she advised on legal and policy matters, including compliance, labor and international coordination; assisted in formulating policies and practices concerning leniency, compliance, deferred prosecutions and litigation; and advised senior leadership on investigations in highly regulated industries, including health care, pharmaceuticals and financial services.

Tee began her government career as an Antitrust Division trial attorney in Washington, D.C. (2015–2019), where she investigated and prosecuted a range of antitrust crimes and related offenses, including bank fraud, wire fraud and obstruction of justice—charging domestic and international matters, individuals and corporations—and handled several leniency applications. Tee was a member of the team that tried the Division’s successful merger challenge in U.S. v. Aetna Inc., and Humana Inc. She also worked with competition enforcement agencies to advise and train on antitrust investigation practices and policies and served as a visiting technical advisor at the Anti-Monopoly Committee of Ukraine.

During her seven-year tenure at the Antitrust Division, Tee served in various leadership capacities in helping to foster a diverse and inclusive culture within the organization. She served as co-chair of the Division’s Diversity Committee and as the Division’s representative to the Attorney General’s Diversity Council. As a key advisor to the AAG on diversity, equity, inclusion and accessibility issues, she was also responsible for leading the Division’s implementation of Executive Order 14035, “Diversity, Equity, Inclusion, and Accessibility (DEIA) in the Federal Workforce.” In recognition of her achievement and exemplary work ethic, Tee was recently awarded the “John Hughes Award for Excellence in Cartel Enforcement” by the U.S. Department of Justice at the 2022 Antitrust Division Assistant Attorney General Awards Ceremony.


Prior to her roles in government, Tee represented a broad range of global clients in antitrust litigation and investigation matters and in regulatory and clearance matters at major international firms. She secured antitrust clearances from DOJ, the FTC, the EC and numerous national competition authorities, and defended clients in civil and criminal investigations, enforcement actions and other regulatory proceedings in North America, Europe, Africa and Asia-Pacific. Tee has significant experience with the Canadian Competition Bureau, the Australian Competition and Consumer Commission, the European Commission, the UK’s Competition and Markets Authority, and the Antimonopoly Committee of Ukraine.

Throughout her varied career, Tee has been involved in most phases of complex white-collar investigation and litigation. She has litigated federal jury trials, including a multimillion-dollar tax fraud case, to a verdict and handled various pre- and post-trial issues, including sentencing and evidentiary issues.


Tee is a member of the American Bar Association and its Antitrust Law Section, and a former co-chair of the Cartel and Criminal Practice Committee of the New York State Bar Association’s Antitrust Section. She has spoken at many conferences on antitrust enforcement issues and served on the faculty of several antitrust programs, including the ABA Antitrust Section’s In-House Institute, International Cartel Workshop and the ABA Antitrust Section’s Masters Course.

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