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Juris Hartmanis (born July 5, 1928, Riga, Latvia) is a Latvian-born American mathematician and computer scientist and cowinner, with American computer scientist Richard E. Stearns, of the 1993 A.M. Turing Award, the highest honour in computer science. Hartmanis and Stearns were cited in the award for their “seminal paper which established the foundations for the field of computational complexity theory.” At the end of World War II, Hartmanis immigrated to Germany, where he studied physics...