Marshall Dennehey

About Marshall Dennehey

Marshall Dennehey describes itself as a defense firm whose practice covers a broad range of litigation, and it was founded in 1962. The firm reports roughly 500 attorneys across 20 offices in Pennsylvania, New Jersey, Delaware, Ohio, Florida and New York. Its New York presence includes a New York City office in Manhattan's Financial District, a Long Island office in Melville, and a Westchester County office located in Purchase. The Long Island office was established in October 2011, first opening in Hauppauge before relocating to Melville in 2014, and the Westchester County office was established in July 2014 as the firm's third office in New York State.

Listings associate the firm with defense litigation, state government law, and federal practice matters. A Martindale-Hubbell profile for its New York office also lists construction and labor law, automobile liability, premises and retail liability, general liability, and fraud and special investigation work. The firm's news pages also reference a professional liability department and insurance coverage work.

Practice areas

Areas of work that Marshall Dennehey 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 Marshall Dennehey.

Registered attorneys

Registration status can change at any time. Confirm any attorney's current status through the official New York Attorney Search.