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John von Neumann  ( / v ɒ n   ˈ n ɔɪ m ən /   von NOY-mən ;  Hungarian :  Neumann János Lajos   [ˈnɒjmɒn ˈjaːnoʃ ˈlɒjoʃ] ; December 28, 1903 – February 8, 1957) was a Hungarian-American  mathematician ,  physicist ,  computer scientist ,  engineer  and  polymath . He was regarded as having perhaps the widest coverage of any mathematician of his time [13]  and was said to have been "the last representative of the great mathematicians who were equally at home in both pure and applied mathematics". [14] [15]  He integrated  pure  and  applied sciences . Born Neumann János Lajos - December 28, 1903 Budapest ,  Kingdom of Hungary ,  Austria-Hungar y Died - February 8, 1957 (aged 53) Washington, D.C. , U.S Von Neumann made major contributions to many fields, including  mathematics  ( mathematical logic ,  measure theory ,  functional analysis ,  ergodic theory ,  group theory ,  lattice theory ,  representation theory ,  operator algebras ,  matrix theory ,  geometry , and  numeri