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 Leipizig Unversity, Department of Theoretical Physics (Werner Heisenberg); and in 1929 to the Federal Institute of Technology, Zurich (Wolfgang Pauli). 1929 Ph.D., Leipzig. Fall 1929-Fall 1932, 'Assistant' to Pauli. Fall 1932-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.