Marianne C. LeBlanc


Achieving record-setting personal injury verdicts in Massachusetts' courts for three decades.

31 St. James Ave.
10th Floor
Boston, MA 02116

Marianne LeBlanc


Marianne LeBlanc is a trial attorney with a proven record of success in the courtroom who has dedicated her legal career of three decades toward the representation of injured clients. With record-setting verdicts in Massachusetts, Marianne’s advocacy skills draw on her commitment to making a difference both for her clients and the community at large. Marianne concentrates in all aspects of serious personal injury litigation, including medical malpractice, liquor liability, premises liability, and nursing home litigation. She has been inducted as a Fellow of the American College of Trial Lawyers, repeatedly named in “Best Lawyers in America” and selected by her peers as one of the Top 100 Massachusetts Super Lawyers and one of the Top 50 Women New England Super Lawyers.

marianne blog feature

“I was hoping that I could make some small piece of the world a better place and I thought the law could help me do that.”

In addition to her practice, Marianne has provided leadership to a wide variety of legal, civic and community organizations. In 2018 she was appointed by the Massachusetts Supreme Judicial Court to a four-year term on the Board of Bar Overseers (BBO) and in 2021 appointed to serve as Chair of the BBO. In addition, she currently serves as Massachusetts Governor to the American Association for Justice (AAJ), as Chair of the Norfolk Superior Court Bench-Bar Committee, and on the Board and Executive Board of the Massachusetts Academy of Trial Attorneys. In 2024, she was appointed by the Massachusetts Supreme Judicial Court to serve on its Standing Committee on Lawyer Well-Being, after having served as the Co-Chair of the Massachusetts Bar Association’s Lawyer Well-Being Committee for over 3 years. She is a past chair of the AAJ Women Trial Lawyers Caucus, and a past President of the Women’s Bar Association of Massachusetts and the Women’s Bar Foundation of Massachusetts. She is also a past Chair of the Civil Litigation Section of the Massachusetts Bar Association. Marianne frequently lectures on continuing legal education programs for Massachusetts Continuing Legal Education (MCLE), the Massachusetts Bar Association, and other professional associations, locally and nationally.

Marianne joined SUGARMAN after receiving her law degree from Boston College Law School in 1993 and has been a principal of the firm since 1999. In addition to her leadership roles in the legal community, Marianne was elected to the Select Board in the Town of Westwood in 2022, after serving for several years as the Chairman of Westwood’s Finance and Warrant Commission.

Significant Cases

medical malpractice Wrongful death following liver transplant

SUGARMAN Principal Marianne LeBlanc obtained a jury verdict in a medical malpractice claim against a Boston-area transplant surgeon for wrongful death as a result of negligent liver transplant surgery.

medical malpractice Severely disabled man asphyxiates in bed rails

Settlement reached for family of 34-year-old man with cerebral palsy who died after accidentally asphyxiating himself between metal railings and the base of his bed after his caretakers left him in his bed awake and unattended for three hours.

medical malpractice Mismanagement of labor results in newborn's death

Settlement of medical malpractice case for parents of newborn who died several hours after her birth due to the mismanagement of her labor and delivery, resulting in severe anoxic injury.

medical malpractice Failure to diagnose hyperbilirubinemia in newborn

Settlement for bilateral hearing loss in newborn where lab test showed elevated levels, but lab and physicians failed to act.

medical malpractice Failure to diagnose fatal heart attack

Settlement in medical malpractice wrongful death case for family of a 47-year-old man who was improperly discharged from the hospital following failure to diagnose and treat an evolving heart attack, resulting in his death several hours after discharge. This was the second largest medical malpractice settlement reported in Massachusetts in 2017.


  • J.D., Boston College, 1993
  • B.A., Wellesley College, 1990

Bar Admission

  • Massachusetts, 1993
  • United States District Court, Massachusetts, 1994
  • United States Court of Appeals, First Circuit, 2020


  • Fellow, American College of Trial Lawyers
  • Massachusetts Bar Association
  • Massachusetts Academy of Trial Attorneys
  • American Association for Justice (AAJ)
  • Women’s Bar Association of Massachusetts
  • Boston Bar Association
  • Fellow, American College of Trial Lawyers
  • Advocate, American Board of Trial Advocates
  • “The Best Lawyers in America”, Personal Injury Litigation – Plaintiffs, 2005-2024
  • “The Best Lawyers in America”, Lawyer of the Year – Personal Injury Litigation, Plaintiff 2022
  • Boston College Law School 75th Anniversary Alumni Award, 2006
  • “Massachusetts Super Lawyers”, Law and Politics, 2004-2023
  • “Top 100 Massachusetts Super Lawyers”, 2004; 2008; 2010-2023
  • “Top 50 Women Massachusetts Super Lawyers”, 2004-2023
  • Boston Magazine, “Top Lawyers – Plaintiff Medical Malpractice”, 2023
  • Lawdragon’s 500 Leading Plaintiff Consumer Lawyers, 2020-2024
  • “Top Women of Law Circle of Excellence Award”, Massachusetts Lawyers Weekly, 2018
  • Distinguished Service Award, American Association for Justice, 2010; 2020-2022
  • Wiedemann Wysocki Citation of Excellence, American Association for Justice, 2006; 2011
  • “40 Under 40 Award”, Boston Business Journal, 2002
  • “Lawyers of the Year”, Massachusetts Lawyers Weekly, 1999
  • “Best Lawyers in Boston”, Boston Magazine, 2002
  • “100 Women of Distinction in Law and Public Service”, The Massachusetts Association of Women Lawyers, 2005
  • David v. Kelly, 100 Mass. App. Ct 443 (2021)
  • Christopher v. Father’s Huddle Cafe, Inc., et al., 57 Mass. App. Ct. 217 (2003)
  • Assetta, et al. v. Safety Ins. Co., 43 Mass. App. Ct. 317 (1997)
  • Top 50 Women - New England
  • Boston Magazine Top Lawyers 2023

How SUGARMAN Can Help You.

  • 1

    We will listen carefully to you.

  • 2

    We will advise you regarding your potential case and the relevant law.

  • 3

    We will investigate for you and bring legal proceedings if appropriate.

SUGARMAN lawyers know that the damage done to lives by injury can be profound, yet often difficult to quantify or describe. And those effects last a lifetime. Our personal injury lawyers have the experience and resources to make a powerful case by developing the evidence and using expert consultation and testimony in order to prove your claim at trial. Just as important, we represent the injured and their families with special regard for the social, mental and emotional issues they face.