Ethan M. Thomas


  • JD, Columbia University School of Law, 2017
  • BA, magna cum laude, Dartmouth College, 2014


  • New York, 2018

Court Admissions

  • U.S. District Court for the Southern District of New York, 2018
  • U.S. District Court for the Eastern District of New York, 2018

Ethan M. Thomas


Ethan Thomas is an associate in the firm’s Litigation and Enforcement practice group. Ethan’s practice includes civil and criminal government enforcement matters, internal investigations, and related litigation. He has also advised clients at both the trial and appellate levels on several matters involving securities and complex litigation.

Prior to joining Ropes & Gray in 2017, Ethan received a J.D. from Columbia Law School, where he was an editor on the Columbia Journal of Law and Social Problems, a James Kent Scholar, and a Harlan Fiske Stone Scholar. He interned during law school for the Honorable Debra Ann Livingston of the United States Court of Appeals for the Second Circuit and the Honorable Roslynn R. Mauskopf of the United States District Court for the Eastern District of New York.

Ethan maintains an active pro bono practice, which includes representing asylum applicants and transgender individuals seeking changes to their legal names and documents. He assisted an appellate litigation team that successfully challenged a high-profile Florida law on First Amendment grounds before the 11th Circuit, sitting en banc.


Ethan’s experience includes representation of:

  • National sports organization in high-profile independent investigation into the abuse of athletes
  • Hedge fund executives in SEC and FCA investigations concerning alleged securities violations
  • Pharmaceutical manufacturer in investigations and litigation under federal and state consumer protection laws
  • Investment company in multinational litigation and discovery involving luxury development project
  • Various private equity firms and financial institutions defending against securities and shareholder claims
  • Numerous companies engaged in cybersecurity and data privacy litigation
  • Individual criminal defendants, including a pro bono client petitioning the United States Supreme Court for writ of certiorari


  • JD, Columbia University School of Law, 2017
  • BA, magna cum laude, Dartmouth College, 2014
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