Oskar Klein

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Oskar Klein (September 15 1894 - February 5 1977) was a Swedish theoretical physicist.

Klein was born in Danderyd outside Stockholm, son of the chief rabbi of Stockholm, Dr. Gottlieb Klein and Antonie (Toni) Levy. He became a student of Svante Arrhenius at the Nobel Institute at a young age, and was on the way to Jean-Baptiste Perrin in France when World War I broke out and he was drafted into the military.

From 1917 he worked a few years with Niels Bohr in Copenhagen and received his doctoral degree at the University College of Stockholm (now Stockholm University) in 1921. In 1923 he received a professorship at University of Michigan in Ann Arbor amd moved there with his recently wedded wife, Gerda Koch from Denmark. Klein returned to Copenhagen in 1925, became docent at Lund University in 1926 and in 1930 accepted the offer of the professorial chair in physics at the Stockholm University College, which had previously been held by Ivar Fredholm until his death in 1927; Klein retired as professor emeritus in 1962. He was awarded the Max Planck medal in 1959.

Klein is credited for inventing the idea that extra dimensions may be physically real but curled up and a very small, an idea essential to string theory / M-theory.

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