New York attorney · Reg. #2312387

John Michael O'Brien

Registered (registry: Currently registered)

Current employer

John M. O'Brien Attorney at Law · Sag Harbor, NY · since at least September 2026

Admission

Admitted 1990, Second Department · ST JOHNS

Employment history

• John M. O'Brien Attorney at Law · Sag Harbor, NY · current

Compiled from NYS Office of Court Administration registration records, published NY Appellate Division decisions, and SEC orders against attorneys; current as of October 2026. Not an official record; verify with the NY Courts Attorney Search.