Welcome to RWJ OB/GYN Associates. RWJ Ob-Gyn Associates, P.A. evolved from the Obstetrics and Gynecology Faculty Practice at the Robert Wood Johnson Medical School. Situated in the Academic Health Science Center in New Brunswick since 1983, the practice has steadily grown and branched out from its base to serve a wide geographic community in the central New Jersey counties of Middlesex, Mercer ....