Assistant professor geology Augustana College, 1935-1937. Instructor and associate in geology University of Illinois, 1938-1942. Assistant and associate geologist Illinois Geological Survey, 1942-1946, geological consultant, 19 -—.
Assistant professor University of Chicago, 1946-1948, associate professor, since 1948. Editor Journal of Geology, since 1953.
Born March 7, 1910