Instructor, Cornell Univercity, 1927-1933, 1936-1937. Assistant professor Alfred U., 1937-1940, associate professor, chairman mathematics department, 1940-1943, professor and department chairman, 1943-1947. Professor and head mathematics department Kent State University, 1947-1953.
Professor Shrivenham American U., England, 1945. Professor and head mathematics department Weihenstephan Agricultural and Technology School, Freising, Germany, 1946. Professor mathematics, Kent State University, 1953-1957, Arizona State University, Tempe, Arizona, since 1957, department chairman mathematics, since 1959.