Michael H. Hayden Partner

Boston, MA

Phone: (617) 439-7541 Fax: (617) 342-4860 Download VCard

Michael H. Hayden

Michael is a partner in the Boston office of Morrison Mahoney and has practiced with the firm for over eighteen years. He concentrates his practice in the area of professional liability, specifically the defense of non-medical professionals including lawyers, architects, engineers, insurance agents, real estate brokers and appraisers. His practice also focuses on retail litigation, product liability, liquor liability/dram shop law, transportation law and environmental law.

Michael's practice has also grown to include insurance coverage, Medicare law and the representation of licensed professionals and citizens before state administrative boards and agencies.  For the last seven years, Michael has also represented a group of local citizens in their opposition to the construction and operation of a large fossil fuel powered facility in a densely populated urban area, with appeals taken before the Massachusetts Superior Court, Massachusetts Appeals Court, First Circuit Court of Appeals and D.C. Circuit Court of Appeals.  Michael is also a member of Morrison Mahoney’s Cybersecurity, Data Protection and Privacy team.

Michael has tried cases to defense verdicts in Massachusetts state and federal court and in Maine state court.  He has also successfully argued before the Massachusetts Appeals Court, the Appellate Division of the Massachusetts District Court and the First Circuit Court of Appeals.

In September 2022, Michael was appointed Treasurer of the Massachusetts Bar Association after serving as Secretary of the Massachusetts Bar Association from September 2021-September 2022.  Michael also served on the MBA’s Executive Management Board and as chair of the MBA’s Judicial Administration Section Council from 2018 to 2021. In 2017 and 2018, he was a member of the section’s Ad Hoc Subcommittee on Diversity, which successfully introduced a resolution at the MBA’s House of Delegates supporting efforts to increase diversity in the court system.  At Morrison Mahoney, Michael has chaired the firm’s Diversity, Equity and Inclusion Committee from 2021-2022.  He also carries a special interest in the history of law in the Commonwealth of Massachusetts and has collaborated in the publication of an historical chronicle of one of the Commonwealth's most esteemed colonial lawyers, Josiah Quincy, Jr.

Representative Experience

  • Judgment on the Pleadings, Norfolk Superior Court, 2022:  G.L. c. 30A, § 14 decision vacating G.L. c. 91 Waterways license and remanding back to MassDEP for further consideration
  • Appeals Court Decision, Massachusetts Appeals Court, 2019:  Rule 12 motion to dismiss decision in favor of client/attorney in legal malpractice action affirmed on appeal
  • Defense Verdict, Barnstable Superior Court (MA), January 2018:  Successful defense of seven-figure engineering malpractice claim after 9-day jury trial
  • Defense Verdict, Salem Superior Court (MA), 2012:  Successful defense of construction accident claim after 4-day jury trial
  • Appeals Court Decision, Massachusetts Appeals Court, 2010:  Summary judgment decision in favor of client/attorney in legal malpractice action affirmed on appeal
  • Defense Verdict, Penobscot Superior Court (ME), 2009:  Successful defense of seven-figure insurance bad faith claim after 5-day jury trial


  • Massachusetts Appeals Court Clarifies How Irrevocable Trusts Can Disqualify MassHealth Eligibility (IN PRACTICE...WITH CNA, November 3, 2016)

Speaking Engagements

  • Chair, MBA Leadership Academy Program on Civility in Written and Oral Communications, March 14, 2022
  • Chair, Morrison Mahoney collaboration with Southern University Law Center webinar, February 11, 2022
  • Chair, View From the Bench:  Brown Bag Series on How to Advance Civil Cases During the Pandemic, May 11, 2021
  • Chair, View From the Bench, Increase of Procedural Limit for District Court and Boston Municipal Court Civil Cases, January 8, 2020
  • Chair, View From the Bench, Recent Amendments to Rules 9A and 9C:  Motion Practice Do’s and Don’ts, October 22, 2019
  • Moderator, View From the Bench and Bar: Unraveling the Mysteries of E-Discovery in Civil Cases, December 4, 2018
  • Moderator, View From the Bench: E-Discovery. May 23, 2018
  • Faculty, Massachusetts Bar Association course, Practicing with Professionalism, 2018-present


  • Massachusetts Bar Association
  • Maine State Bar Association

Honors & Awards

  • Treasurer of the Massachusetts Bar Association (2022-23)
  • Secretary of the Massachusetts Bar Association (2021-22)
  • Chair, Judicial Administration Section Council, Massachusetts Bar Association (2018-21)
  • Chair, Diversity, Equity and Inclusion Committee, Morrison Mahoney LLP (2021-2022)

Boston, MA Office

250 Summer Street
Boston, MA 02210
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Areas of Practice

Bar Admissions

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


  • B.A., magna cum laude — Brandeis University
  • J.D. — Boston College Law School

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