William Ramsey Clark (born December 18, 1927) is an American lawyer, activist and former federal government official. A progressive, New Frontier liberal, he occupied senior positions in the United States Department of Justice under Presidents John F. Kennedy and Lyndon B. Johnson, notably serving as United States Attorney General from 1967 to 1969; previously he was Deputy Attorney General from 1965 to 1967 and Assistant Attorney General from 1961 to 1965.