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John Gross is an optional service partner in the Litigation Department.

John has been lead trial counsel in civil litigations for many major U. S. corporations that include AT8T,  Bear Stearns, Bovis Lend Lease, Brunswick, Champion International, DuPont, Georgia Pacific, Home Depot, International Paper, JPMorgan Chase, Lucent, Mobil, Omnicom, Philip Morris, Reynolds and Witco.

He has been lead appellate counsel in the Appellate Divisions and Court of Appeals in New York, and the Second, Third, Fourth, Fifth, Seventh and D. C. Circuit Courts of Appeal.

John was trial counsel for Silverstein Properties in its insurance coverage litigation for property damage to the World Trade Center’s Twin Towers resulting from the September 11, 2001 terrorist attacks. The jury returned a verdict in favor of Silverstein Properties's position that what happened at the World Trade Center was two occurrences, not one. As a result, Silverstein Properties recovered an additional $1.1 billion from its insurance companies to use to rebuild the World Trade Center. John also advised the City of New York on legal issues arising from the September 11 attacks.

John represented JPMorgan Chase in coverage disputes arising out of the fall of Enron and WorldCom, and in the bank's successful appeal to the New York State Court of Appeals in J.P. Morgan Securities Inc. v. Vigilant Insurance Company, et al.

Chambers USA has cited Proskauer as “the best of the best when it comes to representing policyholders in disputes," noting that "'head and shoulders above the crowd,' John Gross continues to earn plaudits for his work on a number of headline-grabbing cases." John was named Lawyer of the Year in Insurance Law by The Best Lawyers in America © 2016.

John served as a federal prosecutor in the United States Attorney's Office for the Southern District of New York, where he was Assistant Chief of the Criminal Division. He prosecuted Mafia drug dealers, corrupt police officers and white collar criminals.

He was appointed Associate Special Counsel to the United States Department of Justice to assist in investigating allegations involving President Jimmy Carter and the funding of his presidential campaign. During that investigation, he took President Carter’s deposition in the White House — the first time a president testified under oath.

John has lectured on trial practice at the American Bar Association, New York City Bar Association, Practising Law Institute, American Corporate Counsel Association and other professional organizations. He also taught trial advocacy as an Adjunct Associate Professor at New York University School of Law, and has been a faculty member on trial advocacy programs sponsored by the United States Department of Justice, the New York City Bar Association and Harvard Law School.

During the summers of 1968 and 1969, John was a volunteer lawyer in Jackson, Mississippi for the Lawyers Committee for Civil Rights Under Law.

John was the treasurer, and then chairman, of Rudolph W. Giuliani's successful New York City mayoral campaigns and served as chairman of his political committee.

He continues both to serve as an arbitrator and mediator and do pro bono work. His pro bono clients include MFY Legal Services, Inc., the Family Court Volunteer Attorney Program and the Office of Mediation, United States District Court, Southern District of New York.