Brendan V. Sullivan Jr. is an American lawyer who is currently a senior partner in the law firm Williams & Connolly. Sullivan is a white-collar criminal defense attorney best known for his defense of U.S. Marine Lieutenant Colonel Oliver North in the wake of the Iran-Contra scandal in the late 1980s. He is known for his combative style and several prosecutors have been fired, disbarred, or jailed for prosecutorial misconduct Sullivan had uncovered.