Nonna, John M.

John M. Nonna


John Nonna, Co-Managing Partner of our New York office, litigates complex commercial disputes, particularly those involving insurance and reinsurance, involving a range of business matters.  John is particularly well-known for his work in complex insurance and reinsurance disputes and he has handled several of the largest reinsurance arbitrations on record.

As a litigator, John is known for his innovative approaches to complex cases.  He has tried jury and non-jury cases in the areas of accountants' malpractice, fraud, breach of fiduciary duty, breaches of warranties and representations, employment discrimination, distributorship agreements, stock and asset purchase agreements, and M&A disputes.

John is a Fellow of the American College of Trial lawyers. He has lectured at numerous conferences on topics including trial practice, arbitration and mediation, insurance and reinsurance coverage, commercial torts and the attorney-client privilege.

John served as Mayor of Pleasantville, New York and as a Westchester County Legislator where he chaired the Legislation Committee.



  • New York University School of Law, J.D., Order of the Coif, 1975
  • Princeton University, A.B., 1970


  • New York


  • New York State Court
  • U.S. Bankruptcy Court
  • U.S. Court of Appeals for the 11th Circuit
  • U.S. Court of Appeals for the 2nd Circuit
  • U.S. Court of Appeals for the 5th Circuit
  • U.S. Court of Appeals for the 7th Circuit
  • U.S. Court of Appeals for the 9th Circuit
  • U.S. Court of Appeals for the District of Columbia Circuit
  • U.S. District Courts for the Districts of Connecticut
  • U.S. District Courts for the Eastern and Southern Districts of New York
  • United States Supreme Court

Memberships and Affiliations

  • Fellow, American College of Trial Lawyers
  • Board of Directors, AIDA Reinsurance and Insurance Arbitration Society (ARIAS-US)
  • Co-chair, Board of Directors and Trustees, Lawyers’ Committee for Civil Rights under Law
  • Board of Trustees, Westchester Community College
  • Member, New York State Bar Association; Chair, Federal Legislative Priorities Committee; Former Chair, Commercial and Federal Litigation Section; Former Member, House of Delegates
  • Member, New York City Bar Association; Former Member, Committee on State Courts, Council on Judicial Administration
  • Member, American Bar Association; Chair, Annual Meeting Program, 1992-1993; Chair, Commercial Torts Committee, 1986-1987; Section of Tort and Insurance Practice
  • Fellow, American Bar Foundation, New York State Bar Foundation

Clerk Experience

  • New York Court of Appeals
    Hon. Domenick A. Gabrielli
    June 1975 - June 1977
  • Chambers Guide to America’s Leading Lawyers for Business, Insurance Dispute Resolution: Insurer (Band 1, Nationwide and New York); Insurance: Dispute Resolution: Reinsurance (Band 1, Nationwide)
  • Best Lawyers’ 2014 New York City Insurance Law “Lawyer of the Year”
  • American Lawyer Guide, Best Lawyers in America, Commercial Litigation, Insurance Law and Litigation – Mergers & Acquisitions
  • Super Lawyers “Super Lawyer,” New York, Business Litigation (2006-2013)
  • Super Lawyers Business Edition “Super Lawyer,” New York, Business Litigation (2013)
  • Euromoney Guide to the Best of the Best
  • Euromoney Guide to the World's Leading Experts in Commercial Arbitration
  • Euromoney Guide to the World's Leading Experts in Insurance and Reinsurance
  • International Who’s Who of Insurance and Reinsurance Lawyers (2012)
  • “Elite Lawyer,” U.S. Market: Reinsurance, Intelligent Insurer (Summer 2012)
  • Legal 500, Recognized for Litigation: Insurance, Reinsurance and Advice to Insurers
  • Congressional Medal of Achievement, Member, 1980 U.S. Olympic Team

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