James P. O'Brien

Joanne M. Gray is a top attorney recognized by Best Lawyers in the practice area(s) of Mass Tort Litigation / Class Actions - Defendants, Mass Tort Litigation / Class Actions - Plaintiffs and Product Liability Litigation - Defendants. Joanne M., who practices law in New York, New York, has been recognized since 2016. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Joanne M. is held by other top lawyers in the same geographic and legal practic...

Michael Miller is regularly called on to help clients overcome complex litigation challenges in both federal and state courts and in regulatory proceedings. His practice includes all aspects of complex antitrust, privacy, financial services and commercial litigation. Mr. Miller also frequently counsels clients on related issues. Recent cases have included representation of a large U.S. bank in several different U.S. antitrust cases (including several class actions) arising out of credit card ...

Ilan S. Nissan is a top attorney recognized by Best Lawyers in the practice area(s) of Leveraged Buyouts and Private Equity Law. Ilan S., who practices law in New York, New York, has been recognized since 2012. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Ilan S. is held by other top lawyers in the same geographic and legal practice area.

Michael Sullivan is a Senior Trial Partner at Heidell, Pittoni, Murphy & Bach, LLP with more than 25 years of experience litigating and trying cases to verdict throughout New York State. Mr. Sullivan joined HPMB in 2000, became a Partner in the firm in 2004 and has been a member of the firm's Executive Committee since 2014. Mr. Sullivan represents several of the premier medical centers and health systems in the United States, and he specializes in defending those institutions and individu...

David A. Brauner's practice is based on relationships with clients that sometimes span several generations and is concentrated in the areas of estate planning and the administration of estates and trusts, real estate transactions and the representation of owners and cooperatives, and a broad variety of corporate matters. Mr. Brauner provides counseling and advice principally to privately owned, entrepreneurial business entities and their owners and executives. Long active in philanthropic and...

David B. Ramsey is a top attorney recognized by Best Lawyers in the practice area(s) of Franchise Law. David B., who practices law in New York, New York, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which David B. is held by other top lawyers in the same geographic and legal practice area.

Desmond C.B. Lyons is an accomplished attorney with over thirty years of experience in providing strategic legal advice to a diverse array of clients, including corporations, municipalities, boards, and executives. Operating out of White Plains, New York, as part of the Harris Beach Murtha team, Desmond focuses on Commercial Litigation. His practice includes representation of both domestic and international clients, ranging from Fortune 500 companies to individual and family-run businesses, a...

Anthony Pirrotti, Jr. is a top attorney recognized by Best Lawyers in the practice area(s) of Medical Malpractice Law - Plaintiffs. Anthony, who practices law in Scarsdale, New York, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Anthony is held by other top lawyers in the same geographic and legal practice area.

Mark H. Leeds is a top attorney recognized by Best Lawyers in the practice area(s) of Tax Law. Mark H., who practices law in New York, New York, has been recognized since 2010. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Mark H. is held by other top lawyers in the same geographic and legal practice area.

Ty represents individuals, banks and trust companies in estate and trust matters. His work involves sophisticated tax planning in the estate and gift tax and fiduciary income tax areas, including litigating those issues on behalf of his clients. Before joining Sullivan, Ty was a partner with Dewey & LeBoeuf.