Sean Carnathan Attorney Profile on UpCounsel
Sean Carnathan

Sean Carnathan

Business Trial Lawyer

Licensed in
University of Maine School of Law
Sean Carnathan has been litigating business disputes since 1993 and has appeared in courts all over the country. He has substantial trial experience in both state and federal court and has also helped clients in arbitration and mediation. His clients include large established companies as well as start ups and individual executives. His breadth of experience with transactions and companies gone wrong allows him to offer good advice in the role as outside general counsel on how best to manage risk and avoid disputes in the first place.
Top 200 Firm Badge

Representative Clients

Practice Areas

Client Reviews

Sean Carnathan does not have any reviews yet.

Work History

O'Connor, Carnathan and Mack


Feb 2004 - Present

Founder and Managing Partner. Substantial trial experience. Listed in 2016 and 2017 Best Lawyers in America. Massachusetts Super Lawyer since 2008. Martindale Hubbell Preeminent rating. Named to 2016 Irish Legal 100. Works with individuals, start ups and established companies.

Feb 2004 - Present


Associate, Junior Partner

May 1998 - May 2003

Associate and then junior partner of national firm. Member of the Securities Litigation Department.

May 1998 - May 2003

Harvard Law School

Ames Fellow

May 1997 - May 1998

Junior faculty member at Harvard Law School. Responsible for writing materials for first year legal writing program and the moot court program and Ames Moot Court Competition.

May 1997 - May 1998

Lambert Coffin


Aug 1993 - Aug 1996

Early immersion in litigation practice including first chair trial experience.

Aug 1993 - Aug 1996

Maine Supreme Judicial Court

Law Clerk to the Hon. Paul L. Rudman

May 1993 - Jun 1994

Assisted Justice of the Maine Supreme Judicial Court. Performed legal research and wrote memoranda.

May 1993 - Jun 1994

Want to work with
Sean Carnathan?

Get Free Proposals

Share Sean's
profile with your network