Email William

2329 Nostrand Avenue, Suite M…...

Licensed & Certified to Practice In

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New York , New Jersey and Indiana

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October 2018

About William

Following his graduation from the University of Notre Dame, William J. O'Mahony began his legal career in South Bend, Indiana, where he handled the defense of insured policyholders in product liability, general liability and employment discrimination claims and also represented insurance carriers in insurance coverage and bad faith litigation. In 1996, Bill returned to his native New York and became an associate with a large national law firm where he was responsible for the investigation and defense/prosecution of complex corporate and commercial claims, including contract, unfair competition, trade secret and restrictive covenant litigation, corporate dissolution proceedings, employment litigation, and the defense of professional liability and municipal liability claims. Thereafter, he became a partner with a boutique litigation firm, where he represented individuals and corporations in insurance coverage disputes, and in corporate and commercial litigation. In 2015, he joined with Michael Paneth to form Paneth & O'Mahony, PLLC. Bill's practice encompasses all aspects of litigation and consulting in Paneth & O'Mahony, PLLC's life insurance, disability insurance, and insurance claims and litigation practice groups. He has lectured and authored instructional materials on insurance law for the New York State Bar Association and other continuing legal education programs. Bill has also served as a guest lecturer at Touro Law School concerning law practice management and risk management for law firms. Bill has been rated "AV Preeminent" by Martindale Hubbell, the highest possible rating in both legal ability and ethical standards. He also has been inducted as a lifetime member of the Multi-Million Dollar Advocates Forum, which acknowledges excellence in advocacy by lawyers throughout the United States and is limited to attorneys who have won multi-million dollar verdicts, awards or settlements. Bill is also a former member of the New York State Bar Association's Committee on Professional Discipline. - See more at:

work Experience

Rowe Foley Huelat & Gardner Jan. 1, 1993 - Jan. 1, 1996

Rivkin Radler Jan. 1, 1997 - Jan. 1, 2004

Quadrino Schwartz Jan. 1, 2004 - Jan. 1, 2011

Sepe & O'Mahony, PLLC Jan. 1, 2011 - Current

Paneth & O'Mahony, PLLC Jan. 1, 2016 - Current

school Education

University of Pittsburgh School of Law - 1993
JD - Juris Doctor

University of Notre Dame - 1990
BA - Bachelor of Arts


AV Rated Preeminent

Lifetime Membership
Multi-Million Dollar Advocates Forum


New York City Bar Association
2011 - Current

Nassau County Bar Association
2011 - Current

New York State Bar Association
1998 - Current

import_contactsPublished Works

Mallella, Is Aftermath, and Other Recent Develpments in No-Fault Law

Mallela, Its Aftermath, and Other Recent Develpments in No-Fault Law

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