The Professional File collection is about Clark’s public career. The General Correspondence and Subject files contained in the Professional File series documented the first half of Clark's career from the late 1940s to the mid-1960s. In 1942 he was appointed an instructor of psychology at City College, City University of New York, and the first full-time black faculty member of that institution. He continued at City College, City University of New York until his retirement in 1975. Files for City College, City University of New York include material relating to his courses, riots in Harlem in 1943, and students complaints of racial discrimination. Also in the Subject File is material concerning the Northside Center for Child Development established
