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Colleen M. Hennessey

Member

chennessey@harrisbeachmurtha.com
D: (617) 951-2008  
- Boston, MA – Federal Reserve Office

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Colleen Hennessey
Profile
Representative Matters
Resources
Distinctions

Colleen is an experienced trial lawyer with more than 30 years of experience defending clients in high stakes litigation, including product liability, class actions, mass torts and health care litigation. She regularly serves as national counsel, regional counsel and science counsel defending clients in coordinated state court proceedings, multi-district litigation (MDLs) and single plaintiff cases involving complex scientific, medical and regulatory issues. She represents numerous pharmaceutical and medical device manufacturers, as well as health care organizations and health care providers.

Colleen has extensive experience defending health care providers against claims of negligence, personal injury, wrongful death and defamation. She has advised health care providers facing claims of negligence and professional misconduct before various administrative licensing boards.

Colleen defends retailers in products liability matters involving a vast array of products, as well as claims investigations that require immediate investigation and expert evaluation.

Colleen utilizes her litigation experience and knowledge of the health care industry to conduct litigation risk assessments and counsel clients on risk mitigation strategies to avoid litigation.

  • Secured case-ending rulings for pharmaceutical manufacturer in mass tort proceeding of over 8,000 cases alleging permanent gastrointestinal injuries.
  • Coordinated the successful defense of national litigation in state and federal courts on behalf of pharmaceutical manufacturer whose product was alleged to have caused suicide and psychiatric injury.
  • Defended pharmaceutical manufacturer in the defense of individual and class action proceedings asserting claims for permanent neurological injuries and medical monitoring.
  • Defense of global retailer in multi-plaintiff product liability litigation alleging that plaintiffs developed cancer from consumer talcum powder products.
  • Obtaining summary judgment, affirmed by  Nebraska’s Supreme Court, on behalf of pharmaceutical manufacturer after successful exclusion of experts at Daubert hearing.
  • Trial counsel for pharmaceutical manufacturer in state consolidated proceedings obtaining first defense verdict in multi- plaintiff litigation.
  • Represented pharmaceutical manufacturers in claims brought under the False Claims Act and state consumer protection statutes  seeking damages relating to reimbursement for pharmaceuticals under Medicare and Medicaid.
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External Publications
July 24, 2025

"Mass Torts, Pharmacovigilance, and the Litigation Outlook for GLP-1 Drugs," American Conference Institute, GLP-1 Law & Policy Summit

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Professional and Civic

  • American Bar Association, member
  • Boston Bar Association, member
  • Defense Research Institute, member
  • Women’s Bar Association, member
  • International Association of Defense Counsel, member

Recognition

  • Litigation Counsel of America, Senior Fellow
  • Best Lawyers, Product Liability Litigation – Defendants, since 2022
Admissions
MassachusettsU.S. Court of Appeals, Eleventh CircuitU.S. Court of Appeals, First CircuitU.S. District Court, District of Massachusetts
Education

Suffolk University

JD 
1991
cum laude
  • Suffolk University Law Review

Colby College

BA 
1988
magna cum laude
  • Phi Beta Kappa

Capabilities

Legal Practices

Co-Leader for:

Medical and Life Sciences

Member of:

Medical and Life Sciences
Mass Torts and Industry-Wide Litigation
Product Liability and Comprehensive General Liability

Industry Teams

Member of:

Long-Term Care
Health Care
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Colleen Hennessey

Colleen M. Hennessey

Member

chennessey@harrisbeachmurtha.com
Capabilities
People
Harris Beach Murtha Attorneys at Law
Colleen Hennessey

Colleen M. Hennessey

chennessey@harrisbeachmurtha.com
D: (617) 951-2008
Boston, MA - Federal Reserve Office

Profile

Colleen is an experienced trial lawyer with more than 30 years of experience defending clients in high stakes litigation, including product liability, class actions, mass torts and health care litigation. She regularly serves as national counsel, regional counsel and science counsel defending clients in coordinated state court proceedings, multi-district litigation (MDLs) and single plaintiff cases involving complex scientific, medical and regulatory issues. She represents numerous pharmaceutical and medical device manufacturers, as well as health care organizations and health care providers.

Colleen has extensive experience defending health care providers against claims of negligence, personal injury, wrongful death and defamation. She has advised health care providers facing claims of negligence and professional misconduct before various administrative licensing boards.

Colleen defends retailers in products liability matters involving a vast array of products, as well as claims investigations that require immediate investigation and expert evaluation.

Colleen utilizes her litigation experience and knowledge of the health care industry to conduct litigation risk assessments and counsel clients on risk mitigation strategies to avoid litigation.

Areas of Expertise

Legal Practices

Co-Leader for:

Medical and Life Sciences

Member of:

Medical and Life Sciences
Mass Torts and Industry-Wide Litigation
Product Liability and Comprehensive General Liability

Industry Teams

Member of:

Long-Term Care
Health Care
Please select listing to show.

Admissions

MassachusettsU.S. Court of Appeals, Eleventh CircuitU.S. Court of Appeals, First CircuitU.S. District Court, District of Massachusetts

Representative Matters

  • Secured case-ending rulings for pharmaceutical manufacturer in mass tort proceeding of over 8,000 cases alleging permanent gastrointestinal injuries.
  • Coordinated the successful defense of national litigation in state and federal courts on behalf of pharmaceutical manufacturer whose product was alleged to have caused suicide and psychiatric injury.
  • Defended pharmaceutical manufacturer in the defense of individual and class action proceedings asserting claims for permanent neurological injuries and medical monitoring.
  • Defense of global retailer in multi-plaintiff product liability litigation alleging that plaintiffs developed cancer from consumer talcum powder products.
  • Obtaining summary judgment, affirmed by  Nebraska’s Supreme Court, on behalf of pharmaceutical manufacturer after successful exclusion of experts at Daubert hearing.
  • Trial counsel for pharmaceutical manufacturer in state consolidated proceedings obtaining first defense verdict in multi- plaintiff litigation.
  • Represented pharmaceutical manufacturers in claims brought under the False Claims Act and state consumer protection statutes  seeking damages relating to reimbursement for pharmaceuticals under Medicare and Medicaid.

Distinctions

Professional and Civic

  • American Bar Association, member
  • Boston Bar Association, member
  • Defense Research Institute, member
  • Women’s Bar Association, member
  • International Association of Defense Counsel, member

Recognition

  • Litigation Counsel of America, Senior Fellow
  • Best Lawyers, Product Liability Litigation – Defendants, since 2022
Attorney Advertising. Prior results do not guarantee a similar outcome. © 2026 Harris Beach Murtha Cullina PLLC
Content current as of October 13, 2026 2:29 am