Brian Desmarais is an associate in the firm’s Antitrust & Competition practice. Mr. Desmarais focuses on counseling clients on antitrust matters, including premerger filing obligations under the Hart-Scott-Rodino Act (HSR) and representation before government antitrust authorities. He has experience representing clients in merger reviews conducted by the Federal Trade Commission, the Department of Justice, and state enforcement agencies. In addition to advising clients in mergers and acquisitions, Mr. Desmarais also counsels clients on antitrust compliance and in antitrust litigation matters.

Areas of Practice
Domaines D’Expertise





Professional Experience

Mr. Desmarais’s recent experience includes antitrust counseling for clients across several industries, including healthcare, SaaS, life sciences, financial services, electronics, and manufacturing. Representative matters include:

  • Represented multiple healthcare provider organizations in connection with the successful formation of Beth Israel Lahey Health, a deal the Boston Globe recognized as the most significant Massachusetts healthcare deal in decades. The transaction was cleared following issuance of second requests by the FTC and requests for additional information by the Massachusetts Attorney General’s Office.
  • Represented revenue management software provider Rainmaker in its sale to RealPage, Inc. The sale was cleared by the DOJ without conditions after compliance with a second request.
  • Represented SGL Group in the sale of its graphite electrode business to Showa Denko KK of Japan.
  • Represented a financial institution in a class action alleging manipulation of foreign interest benchmarks.

Mr. Desmarais also has an active pro bono practice, representing individuals in both federal and state matters.  Most recently, Mr. Desmarais represented an individual charged with various tax-related offenses in a trial at the U.S. District Court for the Southern District of New York.

While attending law school, Mr. Desmarais completed internships with the U.S. Attorney’s Office for the Southern District of New York, Civil Division, and the New York City Law Department. Mr. Desmarais was a staff editor on New York University School of Law’s Moot Court Board and served on the executive board of OUTLaw.

Prior to attending law school, Mr. Desmarais worked as a paralegal specialist in the U.S. Department of Justice’s Antitrust Division.

Professional Activities

Mr. Desmarais currently serves as the Vice Chair of the NYSBA Antitrust Section’s Mergers Committee, and is a member of the American Bar Association’s Section of Antitrust Law.

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J.D., 2016
New York University School of Law
B.A., 2011
Boston University
(Phi Beta Kappa, Summa Cum Laude)



New York


U.S. District Court for the Southern District of New York
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