Sean Carnathan

Sean is a partner and founder of the firm, O'Connor, Carnathan and Mack, LLC and focuses his practice in complex business litigation with a particular emphasis on insurance coverage, closely held businesses and trust and estate litigation.

Since 1993, although Massachusetts based, Sean has been litigating cases all over the country, from Texas to Minnesota and from California to Maine. He has tried or arbitrated over 25 cases in the state and federal courts of Connecticut, Delaware, Maine, Massachusetts and New Hampshire.

Sean has secured millions of dollars in recoveries for his clients. He regularly advises corporate executives in transition regarding their employment contracts and non-compete obligations.

Sean represents policyholders in disputes with their insurers. While he has substantial experience in a broad range of industries, Sean has spent years representing financial institutions such as State Street Bank and Trust Company, and investment funds such as Tuckerbrook Alternative Investments and NTV Management. Sean has a deep well of experience in real estate and construction disputes and has also represented the owners and operators of many small, closely held companies.

Sean is a regular commentator on legal issues and has published many articles throughout his career. He is the author of Massachusetts Bad Faith Insurance Litigation. The second edition of his book was published in 2020, and offers a complete guide to bad faith insurance cases under M.G. L. c. 176D. Sean is also a member of the Trial Law Institute and Diversity Law Institute of the Litigation Counsel of America. He was recently appointed a neutral at AMANDA ADR, which provides mediation and arbitration services.

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Maine

Maine Board of Overseers of the Bar

Since 1993

Massachusetts

Massachusetts Board of Bar Overseers

Since 1997

New Hampshire

New Hampshire Bar Association

Since 2011

Founder, Partner

O'Connor, Carnathan and Mack, LLC

2004 - Current

Partner

Rubin, Hay & Gould

2003 - 2004

Associate, Junior Partner

WilmerHale (then Hale and Dorr LLP)

1998 - 2003

Securities Litigation Department

Ames Fellow

Harvard Law School

1997 - 1998

Associate

Lambert Coffin

1994 - 1996

Law Clerk

Maine Supreme Judicial Court

1993 - 1994

Harvard Law School

LL.M. (1997) | Intellectual Property

1996 - 1997

University of Maine School of Law

J.D. (1993) | Law

1990 - 1993

Honors: summa cum laude

Activities: Law Review, Moot Court Board, Writing Instructor

Bowdoin College

B.A. (1986) | English Literature

1982 - 1986

Honors: magna cum laude

Activities: Rugby football club

Honoree

Irish Legal 100

2016

Super Lawyer

Super Lawyers

Every year since 2008

Best Lawyers in America -- Trusts and Estates Litigation

U.S. News & World Report

Every year since 2016

Massachusetts Bar Association

Member

Current

Boston Bar Association

Member

Current

Litigation Counsel of America

Senior Fellow

Current

Massachusetts Board of Bar Overseers

Hearing Officer

2015 - Current

Massachusetts Bad Faith Insurance Litigation

Lawyers Weekly Books

Closely Held Business Disputes: Legal Issues and Practical Considerations For Litigation and Negotiation, Boston Bar Association

April 24, 2014

Boston Bar Association

Practical Tips on Policyholder Claims for Insurer Bad Faith, Boston Bar Association

February 8, 2017

Boston Bar Association, Insurance and Tort Litigation Section

Damages, Interest and Attorneys' Fees, MCLE, 10 Winter Street, Boston, MA

June 5, 2017

MCLE

Recent Updates on Close Corporations Law, Massachusetts Bar Association, 20 West Street, Boston, MA

January 11, 2018

Massachusetts Bar Association

Recurrent Discovery Issues in Insurance Bad Faith Litigation, Social Law Library, Boston, Massachusetts

October 3, 2019

Social Law Library