John m. delehanty

John is a trial lawyer with over 40 years of experience in litigating patent, trademark, antitrust, corporate, and employment matters for companies throughout the United States. He is also an experienced mediator and arbitrator.

In addition to litigation, John’s intellectual property practice includes counseling clients, including a major pharmaceutical manufacturer, on patent, trademark, copyright, trade secret, and licensing issues. John is also knowledgeable about legal ethics and professional discipline.

John is a frequent speaker on intellectual property litigation issues at AIPLA meetings. He is also a committed advocate of diversity in the legal profession, and he serves on the firm’s Diversity and Pro Bono committees.

John began his career as a litigator at Paul Weiss Rifkind Wharton & Garrison. He co-founded Parker Auspitz Neeseman & Delehanty, which became the New York office of Morrison & Foerster. Before co-founding the New York office of Mintz Levin, he was a litigation partner at O’Sullivan Graev & Karabell.



2018 - Present: Managing Member, Delehanty Resolutions

2000 - 2018: Partner, Mintz Levin 

1995 - 1999: Partner, O'Sullivan, Graev & Karabell

1987 - 1995: Partner, Morrison & Foerster

1977 - 1987: Partner, Parker Auspitz Neeseman & Delehanty

1970 - 1977: Associate, Paul Weiss Rifkind Wharton & Garrison


Over 45 years’ experience as a trial lawyer litigating substantial matters through trial and appeal in state and federal courts throughout the U.S. Lead trial counsel in 15 major trials (6 jury trials) and 8 appellate arguments. Clients include major industrial, pharmaceutical, energy and financial services companies in the U.S. and abroad, entertainment companies, sports teams and airlines. Trial practice in the last 25 years focused on intellectual property (patent, trademark and copyright) matters (50%), antitrust (25%) and commercial law (25%).


Admitted to the Bar: New York, 1971; U.S. District Court: Southern (1973) and Eastern (1973) Districts of New York; U.S. Court of Appeals: Second (1975), Third (1972), Fourth (1996) and Federal (1989) Circuits; U.S. Supreme Court, 1984.


President and Board Member, American Intellectual Property Law Education Foundation; American Bar Association; New York State Bar Association; Association of the Bar of the City of New York (State Courts Committee; Professional Ethics Committee; Professional Disciplinary Committee, Chair); American Intellectual Property Law Association (Amicus Committee; Vice Chair and Chair, ADR Committee); Intellectual Property Owners Association (ADR Committee); New York Intellectual Property Law Association (Board Member, Chair, Committee on Internet Law).


BA, Brown University 

JD, University of Chicago Law School