Klaus Mann (1906-1949) was a prolific author who engaged in constantly different fields, from journalism to novels, plays and autobiographies. An exile in the United States, he had to reinvent himself as an Anglophone author. This publication sets out to present a new portrait of Klaus Mann as a cultural mediator between Europe and America, starting from his own definition of himself as an American author of European tradition and cosmopolitan mentality. It primarily focuses on his lesser-known and unpublished works, including his second attempt at an exile journal, Decision, his American and German autobiographies, The Turning Point and Der Wendepunkt, and his attempts at incorporating American characters and plots into his fiction.