Theoretical physics (quantum theory of solids of electro-magnetic fields and of the solid nucleus; World War II work on atomic energy). Affiliations include: 1925, Berlin University as student of physics; 1926 transferred to University of Munich, Department of Theoretical Physics (Arnold Sommerfeld); 1928 transferred to Leipzig University, Department of Theoretical Physics (Werner Heisenberg); and in 1929 to the Federal Institute of Technology, Zurich (Wolfgang Pauli). 1929, Ph.D., Leipzig. Fall 1929 to Fall 1932, Assistant to Pauli. Fall 1932 to Fall 1933 Rockefeller Fellowship held in Rome and Cambridge. 1933-1935, research in Manchester University supported by 'academic assistance' grant for German refugees, 1935-1937 Royal Society Mond Laboratory, Cambridge. 1937-1963 professor of applied mathematics, later mathematical physics, University of Birmingham. 1963-1974 Wykeham Professor of Theoretical Physics, University of Oxford. Died in 1995.