John B. Manning

John B. Manning Partner

P 617 670 8800
125 High Street
Oliver Street Tower, 6th Floor
Boston, MA 02110
125 High Street, Oliver Street Tower, 6th Floor, Boston, MA 02110

John B. Manning is a partner with MG+M in Boston, MA, and serves as Firm Chairperson. He also leads MG+M’s Complex Litigation Group, which maintains an active national presence from its 14 offices nationwide. As National Coordinating Counsel for multiple corporations’ litigation matters, John directs the defense of tens of thousands of cases pending in all 50 states. He also represents dozens of corporations in discrete litigation throughout the country and serves on several clients’ national trial teams and litigation strategy units.

John concentrates his practice in products liability, toxic torts, asbestos defense, mass torts, litigation management, infectious disease counseling and litigation, COVID-19, food liability, professional liability, pharmaceutical and medical device litigation, environmental litigation, class actions, intellectual property litigation, and commercial and insurance disputes. He has tried dozens of cases and has extensive experience in appellate practice, alternative dispute resolution, and national litigation management.

John has served as an expert witness regarding issues in national asbestos litigation. A frequent speaker and commentator on products liability litigation, he has Co-Chaired Perrin Conferences’ National Asbestos Litigation Conference annually since 2009. In addition, he has coordinated clients’ lobbying efforts in the US House of Representatives and Senate on national tort reform.

Bar Admissions
  • Massachusetts, 1991
  • US District Court, District of Massachusetts, 1992
  • US Court of Appeals for the First Circuit, 1993
  • Rhode Island, 2003
  • US District Court, District of Rhode Island, 2006
  • Suffolk University Law School, JD, cum laude, 1991
  • Harvard University, BA, cum laude, 1988


  • Best Lawyers In America, Mass Tort Litigation/Class Actions—Defendants, 2013–2024
  • Martindale-Hubbell AV Rated Attorney
  • AM Best Insurance Recommended Attorney
  • Senior Fellow, Litigation Counsel of America
  • Thomson Reuters, Super Lawyers, 2006, 2010, 2018–2019, Super Lawyers Rising Star, 2005


  • Big Brother Association of Greater Boston
  • American Heart Association
  • St. Jude Children's Research Hospital
News & Insights


  • Follow-Up Care Within Physicians' General Duty Owed to Patients, Suffolk University Law Review, Vol. 25
    January 1, 1991
  • The Equal Protection Clause and District Reapportionment: Representational Equality Versus Voting Equality, Suffolk University Law Review, Vol. 25
    January 1, 1991
  • Statute of Frauds and Omission of Compensation Terms from Written Memorandum, Suffolk University Law Review, Vol. 25
    January 1, 1991
Best Lawyers in America
Martindale Hubbell AV Rating
Litigation Counsel of America - Senior Fellow
Super Lawyers
AM Best Recommended Insurance Attorney