Sean Keely is the New York Office Managing Partner, Partner in the Litigation Practice Group and member of the Insurance/Reinsurance Industry Team.

Even while a first-year law student, Sean was involved in reinsurance litigation as an intern with a firm handling reinsurance and insurance insolvency matters. Over 20 years later, Sean brings that deep industry knowledge to bear, litigating and arbitrating commercial disputes with a particular focus on the (re)insurance industry. Clients seek out Sean because he knows the industry and the issues they face. Clients rely on Sean to craft commercial solutions when appropriate and to take cases to trial when necessary to win them. He has successfully tried cases to verdict in U.S. state and federal courts, and to final award in arbitration for clients based in the U.S., London, Continental Europe, and Asia.

Over the past several years, Sean has been at the center of cases addressing developing issues in the industry, including late notice, allocation and aggregation of losses, follow-the-settlements, breaches of the duty of utmost good faith, material misrepresentation, and insurer insolvency.

Beyond the (re)insurance industry, Sean has represented energy companies, financial institutions, manufacturers, cable-television providers, beverage companies, and a variety of other clients in general commercial litigation.


  • Winning a federal jury trial for a European reinsurer on a fraudulent inducement claim, with a US$34.5m verdict, including punitive damages.
  • Winning a federal court decision of first impression establishing the availability of a late notice defense for a reinsurer under California law without the need to show prejudice.
  • Winning summary judgment in New York state court for a pool of reinsurers capping their liability on facultative certificates for both loss and expense and successfully arguing the appeal that unanimously affirmed the judgment.
  • Winning a defense verdict for an insurer finding no coverage for environmental clean-up costs following a bench trial in New Jersey state court.
  • Successfully representing London-market reinsurers in arbitration defending against US$50m of billings arising from asbestos and other mass tort losses.
  • Winning summary judgment for reinsurers recovering nearly US$10m in interest on subrogation recoveries the cedent had wrongfully withheld.
  • Successfully representing a ceding insurer to obtain full recovery from reinsurers of amounts due in respect of settlement of workers compensation losses.
  • Establishing as a matter of first impression procedures in insurance insolvency proceeding for reinsurers to interpose defenses to policyholder claims submitted to insolvent estate.
  • Representing an energy company pursuing claims against an oil and gas field service provider for breaching a contract to supply well stimulation services.
  • Representing a multinational energy company in a government investigation of alleged complicit liability for war crimes in an African zone of conflict.
Honors & Awards: 
  • Chambers-USA Guide to America's Leading Lawyers for Business - Insurance: Dispute Resolution: Insurer - New York, 2019 (cited in multiple years)
  • Insurance: Dispute Resolution (Insurer) (New York), Up and Coming, Chambers USA, 2014
  • Benchmark Litigation: 2019 Local Litigation Star
  • Insurance: Advice to Insurers, Legal 500 US, 2019 (cited multiple years) 
  • Who’s Who Legal: Insurance & Reinsurance, 2019
Professional Activities: 

Education Committee Member, AIDA Reinsurance and Insurance Arbitration Society (ARIAS-US)
Member, Association of the Bar of the City of New York



J.D., New York University School of Law, cum laude
A.B., Georgetown University, magna cum laude

State Bar Admissions

New York