John G. Bagley Partner

Boston, MA Springfield, MA

Phone: (413) 231-1249 Fax: (413) 739-3125 Download VCard

John G. Bagley

John has over thirty years experience as trial counsel in hundreds of actions in state and federal courts. His practice includes professional liability, medical and dental malpractice, product liability, directors and officers liability, employer liability, construction liability, premises liability, motor vehicle liability, abuse and molestation claims and insurance coverage litigation. He has tried to verdict well over 100 complex civil cases in state and federal courts, including many actions for wrongful death and catastrophic injuries. He also represents professionals before licensing boards, including the Board of Bar Overseers, Board of Registration in Medicine and Board of Registration in Dentistry. He advises and counsels health care clients on issues of risk management and health care law. He has extensive appellate experience including appearances before the Supreme Judicial Court, Massachusetts Appeals Court, and the First Circuit Court of Appeals. John is a frequent lecturer to legal, professional, and civic associations and also serves as arbitrator and mediator.


  • American College of Trial Lawyers, Fellow
  • Massachusetts Bar Association
  • Hampden County Bar Association; Member, Past President
  • Defense Research Institute (DRI)
  • American Board of Trial Advocates (ABOTA)
  • Clients Security Board of the MA Supreme Judicial Court, Member
  • Massachusetts Bar Association; Chairperson, Judicial Administration Section (2000–2002)
  • Hampden County Bar Association, President (1998–1999)
  • Hampden District Medical - Legal Society, Chairperson, (1991–2011)
  • Massachusetts Bar Association; Member, Executive Committee, Civil Litigation Section

Honors and Awards

  • Elected by his peers to The Best Lawyers in America© Medical Malpractice Defense guide (2018-2023)
  • Selected to the Massachusetts Super Lawyers magazine list in Personal Injury - Medical Malpractice: Defense (2005–2020)
  • Board of Editors, Massachusetts Lawyers Weekly (1999–2002)
  • Delegate, Massachusetts Joint Bar Committee on Judicial Appointments (1991–1992)
  • Martindale-Hubbell AV Preeminent Peer Review Rated in Legal Ability & Ethical Standards


  • Defense verdicts in numerous complex cases involving substantial exposure including a medical malpractice action alleging brain damage to an infant; a collision between a cement mixer and a bicyclist; a product liability action involving an amputation from an industrial machine; and an employment discrimination action against a major national retail chain.

Boston, MA Office

250 Summer Street
Boston, MA 02210
View Full Office Details

Springfield, MA Office

Tower Square
1500 Main Street
Suite 2400
Springfield, MA 01115
View Full Office Details

Areas of Practice

Bar Admissions

  • United States Court of Appeals for the First Circuit
  • Massachusetts
  • United States District Court for the District of Massachusetts


  • B.A. — College of the Holy Cross
  • J.D., cum laude — Suffolk University Law School

Upcoming Events

No upcoming events. View Past Events

Featured Blogs

Show all Related Blogs

Press Releases

Show all Press Releases