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John Diffley


John F. Diffley, of counsel in Coffey Modica’s Long Island office, aggressively represents clients in high-exposure litigation involving New York labor law, product liability, premises liability, construction defects, and other catastrophic loss and general negligence claims.

1377 Motor Parkway, Suite 212
Islandia, New York 11749



Prior to joining Coffey Modica, John was counsel at a mid-sized Manhattan firm and had experience representing individuals, corporations, banks, local government officials, small businesses, and municipalities in administrative hearings, real property transactions and disputes, commercial transactions, election law, and negligence claims on both sides of the bar.

With a background that also includes finance and sales, John takes a global approach to handling claims, seeking to maximize clients’ benefits at the lowest possible cost. This includes productive investigation for risk transfer strategies and expert analysis for early claim valuation.

John lectured for years on topics in the American criminal justice system as an adjunct professor at the City University of New York.


  • New York
  • US District Court, Eastern District of New York
  • US District Court, Southern District of New York

Memberships & Affiliations

  • New York State Bar Association Trial Lawyer
    – Real Property Law
    – General Practice
    – Business Law


  • St. John’s University School of Law, JD
  • Binghamton University, BA