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Focusing 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 representing 30 municipalities that are prosecuting pharmaceutical companies and distributors for their role in the marketing and overprescribing of highly addictive opioid painkillers.


  • City of Worcester v. Purdue Pharma L.P. et al.: One of the primary attorneys litigating on behalf of thirteen Massachusetts municipalities in coordinated cases against prescription opioid manufacturers and distributors.
  • In re Conn’s Inc. Securities Litigation: represented plaintiffs that alleged they were misled when the Company failed to disclose that its increased sales were due to reduced underwriting standards and the issuance of credit to customers who were unable to repay their debts ($22.5 million settlement).
  • Insulet Corp. Securities Litigation: received approval of $19.5 million settlement for investors alleging Company artificially inflated its stock price by making false and misleading statements surrounding its insulin pump product.
  • In re King Digital Entertainment plc Shareholder Litigation: obtained $18.5 million settlement on behalf of class of investors alleging that the Company omitted material information regarding the Company’s hit game, Candy Crush from its IPO prospectus.
  • At his previous law firm, Mr. Masson helped recover $30 million for investors in In Re Celestica Inc. Securities Litigation.
  • 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. Notable cases include: 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); and People v. Espinal (affirming murder-for-hire and conspiracy convictions for high ranking member of a large-scale cocaine trafficking operation).


State of New York; United States District Courts: Southern and Eastern Districts of New York, Eastern District of Wisconsin


  • Hofstra University School of Law (J.D., cum laude, 2009)
  • Queens College (B.A., English, summa cum laude, 2006)


  • Recognized as a Rising Star for five consecutive years (2015-2019) in SuperLawyers for his work as a class action litigator.
  • Selected for membership in The National Trial Lawyers: Top 40 Under 40 in 2019 for his work in mass torts and the opioid litigation.
  • Authored The Presidential Right of Publicity, 2010 Boston College Intellectual Property & Technology Forum
  • Authored Cracking Open the Golden Door: Revisiting U.S. Asylum Law’s Response To China’s One-Child Policy, 37 Hofstra Law Review 1135 (2009).
  • Served as the Senior Notes and Comments Editor of the Hofstra Law Review and won the 1L Excellence in Torts award in law school.