Clark had decided that farming, manual labor and river work were not going to meet his needs. At the urging of his parents, he entered the University of Mississippi in September 1925. While there, he met his first mentor, historian Charles S. Sydnor, who held a Ph.D. from Johns Hopkins University. Even though Clark had but one class under Sydnor, British history, which wasn't even within his interests, the two had "deep conversations" about the rich heritage of the old South. Sydnor encouraged Clark to follow his interests into post graduate studies in the field of History.