By the time of his retirement, SU had grown to be America's largest historically black university by enrollment.
[4] He served as its president from 1938 to 1969, overseeing large-scale development of curriculum, buildings on campus and graduate programs.
[4] From 1960, numerous students at the university began to press for change and many were active in the civil rights movement.
[4] By the time of Clark's retirement in 1969, SU had more than 11,000 students[2] and it had become the largest historically black university in the United States by enrollment.
[2] He attended the 1964 World Alliance Commission on Race Relationships conference in Geneva, Switzerland as a delegate.