Mark is an antitrust lawyer whose practice focuses on merger control, including filings under the Hart-Scott-Rodino (HSR) Act and similar “merger control” laws around the world. Mark has represented clients in merger investigations by the U.S. Department of Justice and Federal Trade Commission. Mark recently completed a secondment with a global power management company where he served as in-house competition counsel. He also is an experienced litigator who has represented clients in state and federal trial and appellate courts, arbitration tribunals, and administrative proceedings involving antitrust, competition, and other complex claims, including class actions. He has argued appeals before the U.S. Court of Appeals for the Sixth Circuit and the Ohio Court of Appeals and represented clients in appeals before other appellate courts, including the New York Court of Appeals and the U.S. Court of Appeals for the Ninth Circuit. Mark also has represented companies and individuals facing criminal inquiries and investigation. He is an active participant in the firm’s pro bono practice.

Prior to joining Thompson Hine, Mark clerked at the New York Court of Appeals and was an extern at the United States Attorney’s Office, Northern District of New York.


Co-presenter, "Presidential Executive Order Targets Changes in Antitrust Enforcement," Thompson Hine Competition Cafe Webinar Series, April 2022

  • Received a 2022 Best Lawyers: Ones To Watch recognition for Commercial Litigation and Litigation-Antitrust; included in the inaugural edition of Best Lawyers: Ones to Watch for Commercial Litigation
  • Selected to the Ohio Rising Stars list, 2019-2021
  • Champion and Best Final Round Advocate, Mackenzie Hughes Edmund H. Lewis Appellate Competition
  • Excellence Award, New York State Academy of Trial Lawyers
  • CALI Excellence for the Future Awards: Appellate Advocacy, Constitutional Law, Constitutional-Criminal Procedure, Evidence and Legal Writing
Professional and Civic

Professional Associations

  • American Bar Association, Antitrust Section
    • Counsel to the Section Vice Chair
    • Research Editor, Antitrust Law Journal
  • Federal Bar Association, Northern Ohio Chapter
  • Leukemia & Lymphoma Society, Northern Ohio Chapter, Young Professionals Board