Affiliations Research 1926Graduate AssistantshipUniversity Of Michigan1927Graduate Assistant In ZoologyUniversity Of Michigan1929Graduate StudentUniversity Of Chicago1936Assistant Professor Of ZoologyColumbia University1938Assistant Professor Of ZoologyColumbia University 1926Zoology[role unknown]1927[subject unknown][role unknown]1929[subject unknown][role unknown]1936[subject unknown]Independent1938[subject unknown]Independent
