Suggest an update Name* Categories* State* Locality* ZIP* Street address* Phone* Website* Company description* Lawyer John Michael O'Brien, Practice Areas No known practice areas. is located in the city of Sag Harbor, the state of New York. Attorney legal address John M. O'Brien Attorney At LawPo Box 3147Sag Harbor, NY, 11963-0405. For more information, please call (631) 725-2020 Your comments* (not for publishing) * — Required information John Michael OBrien ← View details John M. O'Brien Attorney At LawPo Box 3147Sag Harbor, NY, 11963-0405, Sag Harbor, New York (631) 725-2020