He taught at a number of institutions before joining Columbia University in 1950. There, in addition to teaching political science, he undertook a number of administrative roles, serving successively as head of the department of public law and government (1959–61), Dean of Columbia College (1962–67), and Vice-President and Provost (1967–69). In 1969, Truman "stepped down after a tumultuous year of student unrest. During the student-lead takeover of the University, Truman was continually mentioned as a University administrator who retained the student body's respect."