Career
In 1936, he went to America. In 1942, he became a United States 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).