Scientific background in solid state physics; early work in group theory; work in solid state with Frederick Seitz. His contemporaries; John Bardeen. Stored energy problem; war work on the nuclear reactor. Teaching career. Also prominently mentioned are: Felix Bloch, David Bohm, Milton Burton, Leon Cooper, Karl Kelchner Darrow, James Franck, Werner Heisenberg, Conyers Herring, John Robert Schrieffer, Erwin Schrödinger, I. Schur, John Clarke Slater, Roman Smoluchowski, Leo Szilard, Weissenberg; Argonne National Laboratory, Physical Review, Princeton University, and University of Chicago Metallurgical Laboratory.