From "American Men and Women of Science" :

Robert Edmond Gregg

Systematic Entomology

Born: April 19, 1912

Married: 1939

Education: University of Chicago, B.S., 1935, 
           Ph.D. (Zoology), 1941

Professional Experience: EMERITUS PROFESSOR of BIOLOGY, 
             UNIVERSITY or COLORADO, BOULDER, 1977-; 
             From Instructor to Professor, University 
             of Colorado, Boulder, 1944-1977; 
                  Instructor Zoology, Minnesota State Teachers 
             College, Duluth, Minnisota 1940-1944.

Memberships: Sigma Xi

Research: Geographic Distribution, Ecology and Taxonomy 
          of Ants; 
          Origin of Castes in Ants.