Sean T. Masson


  • Assistant District Attorney in the Manhattan DA’s Office
  • Super Lawyers “Rising Star” (2015-2019) for class action litigation
  • Senior Notes and Comments Editor of the Hofstra Law Review
  • During law school won the 1L Excellence in Torts award


Mr. Masson is based in the Firm’s New York office and focuses his litigation efforts on mass tort, class action, and complex commercial cases. Mr. Masson represents institutional investors, government entities and consumers around the country. Currently, he is one of the lead attorneys in the Firm prosecuting pharmaceutical companies and distributors for their role in the marketing and overprescribing of highly addictive opioid painkillers.

Prior to entering the private sector, Mr. Masson served as an Assistant District Attorney in the Manhattan DA’s Office, successfully arguing over 40 appeals in state and federal courts and gaining extensive experience with large-scale government and regulatory investigations.

Mr. Masson’s publications include: The Presidential Right of Publicity, 2010 Boston College Intellectual Property & Technology Forum 012001 and Note, Cracking Open the Golden Door: Revisiting U.S. Asylum Law’s Response To China’s One-Child Policy, 37 Hofstra Law Review 1135 (2009).


  • People v. McKelvey (upheld 75-year sentence for serial rapist preying on homeless women)
  • People v. Chance (creating precedential law on issue of first impression regarding the disposal of stolen property under N.Y. Penal Law)
  • People v. Espinal (affirming murder-for-hire and conspiracy convictions for high ranking member of a large-scale cocaine trafficking operation)