Henry Churchill King (1858–1934) became Oberlin's sixth president in 1902. At Oberlin from 1884 onward, he taught in mathematics, philosophy, and theology. Robert K. Carr served as Oberlin College president from 1960 to 1970, during a tumultuous period of student activism. Under his presidency, he increased the school's physical plant, with 15 new buildings completed. Under his leadership, student involvement in college affairs increased, with students serving on nearly all college committees as voting members (including the Board of Trustees). Despite these accomplishments, Carr clashed repeatedly with the students regarding issues related to the Vietnam War, and he left office in 1969 (with History professor Ellsworth C. Clayton taking over as acting president), and was forced to resign as president in 1970.