Sean Carnathan
Complex Commercial and Insurance Coverage Litigation
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.
- Harvard Law School
- LL.M. (1997) | Intellectual Property
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- University of Maine School of Law
- J.D. (1993) | Law
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- Honors: summa cum laude
- Activities: Law Review, Moot Court Board, Writing Instructor
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- Bowdoin College
- B.A. (1986) | English Literature
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- Honors: magna cum laude
- Activities: Rugby football club
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- Founder, Partner
- O'Connor, Carnathan and Mack, LLC
- - Current
- Partner
- Rubin, Hay & Gould
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- Associate, Junior Partner
- WilmerHale (then Hale and Dorr LLP)
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- Securities Litigation Department
- Ames Fellow
- Harvard Law School
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- Associate
- Lambert Coffin
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- Law Clerk
- Maine Supreme Judicial Court
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- Massachusetts Bad Faith Insurance Litigation
- Lawyers Weekly Books
- Closely Held Business Disputes: Legal Issues and Practical Considerations For Litigation and Negotiation, Boston Bar Association
- Boston Bar Association
- Practical Tips on Policyholder Claims for Insurer Bad Faith, Boston Bar Association
- Boston Bar Association, Insurance and Tort Litigation Section
- Damages, Interest and Attorneys' Fees, MCLE, 10 Winter Street, Boston, MA
- MCLE
- Recent Updates on Close Corporations Law, Massachusetts Bar Association, 20 West Street, Boston, MA
- Massachusetts Bar Association
- Recurrent Discovery Issues in Insurance Bad Faith Litigation, Social Law Library, Boston, Massachusetts
- Social Law Library
- Honoree
- Irish Legal 100
- 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
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- Boston Bar Association
- Member
- Current
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- Litigation Counsel of America
- Senior Fellow
- Current
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- Massachusetts Board of Bar Overseers
- Hearing Officer
- - Current
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- Maine
- Maine Board of Overseers of the Bar
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- Massachusetts
- Massachusetts Board of Bar Overseers
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- New Hampshire
- New Hampshire Bar Association
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Free Consultation
Initial consultation always free. -
Credit Cards Accepted
Visa and Mastercard - Contingent Fees
- Business Law
- Business Contracts, Business Dissolution, Business Finance, Business Formation, Business Litigation, Franchising, Mergers & Acquisitions, Partnership & Shareholder Disputes
- Insurance Claims
- Bad Faith Insurance, Business Insurance, Disability Insurance, Health Insurance, Life Insurance, Motor Vehicle Insurance, Property Insurance
- Appeals & Appellate
- Civil Appeals, Federal Appeals
- English