Heisenberg, Werner, 1901-1976

Werner Karl Heisenberg (; German: [ˈvɛʁnɐ ˈhaɪzn̩bɛʁk] ; 5 December 1901 – 1 February 1976) was a German theoretical physicist, one of the main pioneers of the theory of quantum mechanics and a principal scientist in the German nuclear program during World War II. Heisenberg published his Umdeutung paper in 1925, a major reinterpretation of old quantum theory. In the subsequent series of papers with Max Born and Pascual Jordan, during the same year, his matrix formulation of quantum mechanics was substantially elaborated. He is known for the uncertainty principle, which he published in 1927. He received the Nobel Prize in Physics in 1932 "for the creation of quantum mechanics". Heisenberg also made contributions to the theories of the hydrodynamics of turbulent flows, the atomic nucleus, ferromagnetism, cosmic rays, and subatomic particles. He introduced the concept of a wave function collapse. He was also instrumental in planning the first West German nuclear reactor at the Kernforschungszentrum Karlsruhe, together with one in Garching at the Technische Hochschule München, in 1957 (both were research reactors). Following World War II, Heisenberg was appointed Director of the Kaiser Wilhelm Institute for Physics, which soon thereafter was renamed the Max Planck Institute for Physics. He was director until it was moved to Munich in 1958. He was Director of the Max Planck Institute for Physics and Astrophysics from 1960 to 1970. Heisenberg was also President of the German Research Council, Chairman of the Commission for Atomic Physics, Chairman of the Nuclear Physics Working Group, and President of the Alexander von Humboldt Foundation.