 University of Chicago , Division of Social Sciences , Chicago : assistant , 1952 – 53 ; resident associate , 1953 – 54 ; 
 University of Chicago , Division of Social Sciences , Chicago : assistant , 1952 – 53 ; resident associate , 1953 – 54 ; 
University of Chicago , Division of Social Sciences , Chicago : assistant , 1952 – 53 ; resident associate , 1953 – 54 ;