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In 1936, he went to America. In 1942, he became a US citizen. Gumpert provided the German author Thomas Mann with information about the course of the disease of syphilis. Mann used this information in writing his Faust novel, Doktor Faustus: das Leben des deutschen Tonsetzers Adrian Leverkühn, erzählt von einem Freunde. (Cited by Gunilla Bergsten in Thomas Mann's Doctor Faustus (University of Chicago Press, 1963, p. 57.)