Michael S. Antonellis

Office: 860-375-1877
Direct: 857-321-7054
Fax: 617-227-0927
Email: mantonellis@sloanewalsh.com

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.

  • Insurance Dispute Law, Insurance Coverage & Bad Faith
  • Property Insurance Law
  • Subrogation Law
  • Product Liability Defense
  • Construction Defect Law & Construction Law
  • Environmental Law & Toxic Tort Law
  • Automobile & Trucking Law
  • HIPAA, Health Care, Data Breach & Privacy
  • General Liability Litigation
  • Class Action Defense
  • COVID-19 Claims and Issues
  • Appraisal and Reference Law, Examination Under Oath, Insurance Dispute Law
  • Massachusetts, 1995
  • Connecticut
  • U.S. District Court of Massachusetts
  • U.S. District Court of Connecticut
  • U.S. Court of Appeals 2nd Circuit

Suffolk University Law School, Boston, Massachusetts
J.D. – 1994

United States Merchant Marine Academy, Kings point, New York
B.S. – 1987
Major: Marine Engineering

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

Connecticut Bar Association
CBA Insurance Law Section
Massachusetts Bar Association


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