Michael S. Antonellis

Michael S. Antonellis


Michael S. Antonellis

Michael S. Antonellis handles a broad range of civil litigation matters including insurance coverage, first-party residential and commercial property losses, bad faith litigation, insurance defense, subrogation, and maritime and admiralty cases. Mr. Antonellis is admitted to practice in state and federal courts in Connecticut and Massachusetts. He is a member of the Connecticut Bar Association, the Connecticut Bar Association Insurance Law Section, and the Massachusetts Bar Association.

He is a graduate of the United States Merchant Marine Academy (Kings Point, NY) and Suffolk University Law School (Boston, MA).  Prior to joining Sloane and Walsh, Mr. Antonellis was a U.S. Coast Guard officer, retiring from active duty as a Captain. While on active duty, he participated in numerous complex maritime and federal grand jury investigations of individuals and corporations. He has led and advised on numerous complex, multifaceted investigations involving transportation and property casualties concerning significant loss, and has extensive experience liaising with federal, state and local agencies. He has also served as a trial attorney and was the senior military justice advisor throughout the northeast region.

As a result of his efforts throughout his military career, Mr. Antonellis has received numerous awards and accolades, including being recognized as the Judge Advocates Association, Outstanding Career Armed Services Attorney (2007).

Prior to joining the U.S. Coast Guard, Mr. Antonellis held a U.S.C.G. license as a Second Assistant Engineer, and has sailed aboard numerous U.S. Merchant Marine vessels.

Practice Areas

  • Insurance Practice
  • Coverage and Bad Faith
  • Property and Insurance Law
  • Subrogation
  • General Liability Litigation
  • Maritime and Admiralty Law

Bar Admissions

  • Connecticut
  • U.S. District Court District of Connecticut
  • Massachusetts
  • U.S. District Court District of Massachusetts


  • Suffolk University Law School, Boston, Massachusetts
    • J.D. - 1994
  • United States Merchant Marine Academy, Kings point, New York
    • B.S. - 1987
    • Major: Marine Engineering

Awards & Honors

  • Judge Advocates Association Outstanding Career Armed Services Attorney
  • Coast Guard Meritorious Service Medal
  • Coast Guard Commendation Medal
  • Coast Guard Achievement Medal
  • National Defense Service Medal

Professional Activities

  • Connecticut Bar Association
  • CBA Insurance Law Section
  • Massachusetts Bar Association

Lectures and Publications

Representative Cases