John Dupuis

Senior Counsel

(617) 279-8211 Email me


John Dupuis is an associate in the Boston office of CMBG3 Law. Before joining CMBG3, he worked with plaintiffs in complex product liability litigation in both State and Federal Courts. His initial job after graduating law school found him working on Rhode Island's first Multi-District Litigation alongside lead counsel, eventually becoming a member of the trial team. Following the completion of two bellwether trials in the Rhode Island MDL, Attorney Dupuis was hired by law firms around the country to consult on their specific cases. He also went on to serve as lead and local counsel in cases around the country for MDL related products.

He is especially adept at pre-trial litigation and conducting discovery, and he strongly believes that discovery is one of the most critical phases of any case. As a result, he works relentlessly to learn all he can about his clients, as well as everything he can discover about the parties on the other side. With this knowledge, Attorney Dupuis can provide his clients with aggressive, vigorous, and relentless representation, continuously fighting for the best outcome possible.


  • Roger Williams University School of Law, J.D., 2008
  • Franklin & Marshall College, B.A. Anthropology, 1992


  • Maine
  • Massachusetts
  • Rhode Island
  • United States District Court for the District of Massachusetts
  • United States District Court for the District of Rhode Island
  • United States District Court for the District of New Jersey (pro hac vice)
  • United States District Court for the Middle District of Florida (pro hac vice)
  • United States District Court for the Southern District of Florida (pro hac vice)


  • Woolsack Honor Society, Penn State Law

Speaking Engagements

  • I am rated “AV-Preeminent” by Martindale-Hubbell, signifying the highest level of legal knowledge, analytical capabilities, judgment, communication ability, and legal experience.
  • I was named to the “Rising Stars” list in New England Super Lawyers for five years, including 2016.  Only 2.5% of the attorneys in Massachusetts are selected as “Rising Star” Super Lawyers.
  • I am also listed as a Massachussetts “Super Lawyer” for 2017.
  • I also served as a judge for the Yale University Mock Trial Competition for the past six years.