Sean T. Carnathan

Attorney Profile

Top Rated Insurance Coverage Attorney in Burlington, MA

O'Connor, Carnathan and Mack, LLC
 | 67 S Bedford St, Suite 400W
Burlington, MA 01803
Phone: 781-359-9002
Fax: 781-359-9001
Selected To Super Lawyers: 2008 - 2021
Licensed Since: 1997
Practice Areas:
  • Insurance Coverage (50%),
  • Business Litigation (50%)
  • Free Consultation
Attorney Profile

Founder of the firm and a current partner, Sean T. Carnathan represents clients in Boston, Massachusetts, and throughout the state as an attorney with O’Connor, Carnathan and Mack, LLC. He represents clients in matters of commercial and business law, bad faith insurance, insurance law and litigation. For the past several years, The Best Lawyers in America included him in their Trusts and Estates list, and for his high ethical standards and long list of successful results, he holds the highest peer rating possible of AV Preeminent* from Martindale-Hubbell.

Mr. Carnathan is admitted to practice in New Hampshire, Maine and Massachusetts. After graduating magna cum laude from Bowdoin College with a Bachelor of Arts, he then moved on to law school. At the University of Maine School of Law, he graduated summa cum laude and obtained his Juris Doctor. He then attended Harvard Law School, where he earned a Master of Laws.

In 2016, Mr. Carnathan was named an Irish Legal 100 Honoree, and he is currently a Hearing Officer for the Massachusetts Board of Bar Overseers. A Senior Fellow with the Litigation Counsel of America, he is a Barrister for the Order of Certus and the Order of Veritas.

Mr. Carnathan is also a FINRA dispute resolution arbitrator. He gives back to his community with charity work with the following organizations: Volunteer Lawyers for the Arts, the Chelmsford Center for the Arts and the Helen Gee Chin Scholarship Foundation. During his career spanning over two decades, he has obtained compensation in the millions for his clients through verdict or settlement.

* AV®, AV Preeminent®, Martindale-Hubbell Distinguished and Martindale-Hubbell Notable are certification marks used under license in accordance with the Martindale-Hubbell certification procedures, standards and policies. Martindale-Hubbell® is the facilitator of a peer review rating process. Ratings reflect the anonymous opinions of members of the bar and the judiciary. Martindale-Hubbell® Peer Review Rating™ fall into two categories – legal ability and general ethical standards.

Practice Areas
  • 50%Insurance Coverage
  • 50%Business Litigation
Focus Areas

Insurance, Bad Faith Insurance


Selected to Super Lawyers for 14 yearsbottom-image

Super Lawyers: 2008 - 2021

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About Sean Carnathan

Admitted: 1997, Massachusetts

Professional Webpage:


  • Harvard Law School Ames Fellow
  • Barrister, Order of Certus
  • Senior Fellow, Litigation Council of America
  • Barrister, Order of Veritas
  • FINRA Dispute Resolution Arbitrator
  • Massachusetts Super Lawyer, 2008 to date
  • Massachusetts Board of Bar Overseers Hearing Officer, 2015 to date
  • Martindale Hubbell Preeminent Rating
  • Best Lawyers in America, Trusts and Estates Litigation, US News and World Report, 2016 to Date

Bar/Professional Activity:

  • New Hampshire
  • Maine
  • Massachusetts
  • Associate Editor, ABA's Litigation News 2004 to 2014

Pro bono/Community Service:

  • Diversity Law Institute of the Litigation Counsel of America, Member
  • Trial Law Institute, Member
  • Board, Helen Gee Chin Scholarship Foundation, 2014
  • Hearing Officer, Massachusetts Board of Bar Overseers, 2015
  • Board, Chelmsford Center for the Arts
  • Volunteer Lawyers for the Arts

Scholarly Lectures/Writings:

  • Collected works available on firm web site,
  • Author, Massachusetts Bad Faith Insurance Litigation

Representative Clients:

  • State Street Bank and Trust Company, Excelitas Technologies, Inc., Applied Tissue Technologies, Organogenesis

Other Outstanding Achievements:

  • Irish Legal 100 Honoree, 2016


  • Tracking important decisions of the Massachusetts Superior Court Business Litigation Session since 2004, Session Watch
  • Session Watch (quarterly print newsletter), Razor (monthly e-newsletter), subscribe at, Session Watch

Educational Background:

  • Bowdoin College, A.B., Magna Cum Laude
  • Harvard Law School, LL.M.
Find Me Online
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Office Location for Sean T. Carnathan

67 S Bedford St
Suite 400W
Burlington, MA 01803

Phone: 781-359-9002

Fax: 781-359-9001

Sean T. Carnathan:

Last Updated: 4/26/2021

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