Physicist (quantum theory, quantum mechanics, uncertainty principle, unified field theory) and administrator. On the physics faculty at Unviersitt̃ Gt̲tingen (1923-1924, 1925-1926); Kobenhavns Universitet (1924-1925, 1926-1927); Universitt̃ Leipzig (1927-1941); director, Kaiser-Wilhelm Insitut f r Physik (1941-1945); director, Max-Planck Insitut f r Physik (1946-1958); and director, Max-Planck Institut f r Physik und Astrophysik (1958-1970).