Marks, O’Neill, O’Brien, Doherty & Kelly, P.C.

About Marks, O’Neill, O’Brien, Doherty & Kelly, P.C.

Marks, O’Neill, O’Brien, Doherty & Kelly, P.C. is a law firm that presents itself as a defense litigation practice serving corporations, insurance carriers and individuals, with a track record that its website describes as spanning more than twenty-five years. The firm says it partners with clients from the private and public sectors, including corporations and self-insured entities, and offers a regional approach to litigation. Practice areas listed on its website include casualty, professional liability, toxic tort and mass tort matters, construction accident and construction defect work, employment law and municipal and public entity matters, bankruptcy and appellate advocacy, healthcare and catastrophic and excess loss, transportation and trucking, data privacy and cyber security, and workers' compensation.

The firm lists offices in Pennsylvania (Philadelphia and Pittsburgh), New Jersey, Delaware, New York and Maryland. Its New York locations are given on the website as New York City and Westchester County, where the listed address is 580 White Plains Road in Tarrytown.

Practice areas

Areas of work that Marks, O’Neill, O’Brien, Doherty & Kelly, P.C. describes on its own website. They describe the organization as a whole, not the practice of any individual attorney listed below.

Organization profile based on its official website and public sources (reviewed October 29, 2026). Attorney list from the New York State Unified Court System registration data. Not affiliated with Marks, O’Neill, O’Brien, Doherty & Kelly, P.C..

Registered attorneys

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