John B. Manning

John B. Manning Partner

P 617 670 8800 F 617 670 8801
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 Manion Gaynor & Manning in the firm’s Boston, MA office. He chairs the firm’s Complex Litigation Practice Group, which maintains an active national presence through MG+M’s offices in Boston, MA, Los Angeles, CA, New Orleans, LA, San Francisco, CA, Wilmington, DE, Hattiesburg, MS, Lake Charles, LA, Providence, RI, Walnut Creek, CA, and Miami, FL. John represents dozens of corporations in litigation throughout the country and serves on several clients’ National Trial Teams. As National Coordinating Counsel for multiple products manufacturers, he directs the defense of more than 200,000 asbestos lawsuits pending in all 50 states.

Bar Admissions
  • Massachusetts, 1991
  • U.S. District Court - District of Massachusetts, 1992
  • U.S. Court of Appeals - 1st Circuit, 1993
  • Rhode Island, 2003
  • U.S. District Court - District of Rhode Island, 2006
  • Suffolk University Law School, J.D. cum laude, 1991
  • Harvard University, B.A. cum laude, 1988

John concentrates his practice on representing corporate clients in tort defense, products liability, mass torts, class actions, toxic torts, asbestos, litigation management, food liability, professional liability, pharmaceutical and medical device litigation, environmental litigation, intellectual property litigation, construction defect litigation, general liability, premises liability, and business and insurance disputes. He has tried dozens of cases and has extensive experience in appellate practice, alternative dispute resolution, expert witness development, and national litigation management. John has served as an expert witness regarding issues in asbestos litigation; he is a frequent speaker and commentator on products liability litigation; and he has coordinated clients’ lobbying efforts in the U.S. House and Senate to create national asbestos legislation. He is licensed to practice in Massachusetts and Rhode Island.



  • Best Lawyers In America, Mass Tort Litigation and Class Actions for Defendants, 2013-2018
  • Martindale-Hubbell AV Rated Attorney
  • AM Best Insurance Recommended Attorney
  • Senior Fellow, Litigation Counsel of America
  • Massachusetts Super Lawyer


  • Big Brother Association of Greater Boston
  • American Heart Association
  • St. Jude Children's Research Hospital
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Speaking Engagements

  • Co-Chair, “Perrin Conferences National Asbestos Litigation Conference,” 2009 through 2016
  • Speaker, Certified In-House CLE Presentation, “Products Liability Trial Demonstration,” 2011
  • Speaker, Certified In-House CLE Presentation, “Asbestos Trial Demonstration,” 2012
  • Speaker, Certified In-House CLE Presentation, “Asbestos Bankruptcy Update,” 2011
  • Speaker, DRI Asbestos Medicine Conference, “National Verdict Update and Analysis,” 2010
  • Speaker, DRI Asbestos Medicine Conference, “Asbestos Bankruptcy Update and Analysis,” 2009


  • The Equal Protection Clause and District Reapportionment: Representational Equality Versus Voting Equality, Suffolk University Law Review, Vol. 25, 1991, No. 2., 1991
  • Follow-Up Care Within Physicians' General Duty Owed to Patients, Suffolk University Law Review, Vol. 25, R. I. Survey 1991, No. 2
  • Statute of Frauds and Omission of Compensation Terms from Written Memorandum, Suffolk University Law Review, Vol. 25, R. I. Survey 1991, No.2, 1991


Martindale Hubbell AV Rating
Super Lawyers
AM Best Recommended Insurance Attorney
Best Lawyers in America
Litigation Counsel of America - Fellow