Came to the United States, 1930, naturalized, 1941. Assistant professor of University Oslo, 1928-1930. Assistant professor physics University of Chicago, 1930-1940, associate professor, 1940-1945, professor, 1945-1979, department chairman physics, 1945-1950, 56-59, dean division physical science, 1959-1962, Ernest DeWitt Burton Distinguished professor physics, 1962-1974, now emeritus.
President American Society X-Ray and Electron Diffraction. Rockefeller Foundation fellow, 1928, Guggenheim Foundation fellow, 1935.
Born February 5, 1906