On returning to Germany he launched his journalistic career in March 1947 as a contributing editor to the monthly news magazine Frankfurter Hefte, recently founded by Eugen Kogon (1903–1987) and Walter Dirks (1901–1991). Of particular significance in the context is the influential essay he co-wrote with Walter Weymann-Weyhe headed "Wir aus dem Kriege: Der Weg der jüngere Generation" ("loosely, "We from the war: The way of the younger generation"") in which the authors formulated a self-image of the so-called "young generation" for the post-war years. He was in no doubt that Germany needed to focus on a closer collaboration with other European states. Between 1948 and 1951 he served as chairman of the . With the central portion of Germany administered since 1945 as the increasingly separated Soviet occupation zone, Proske now found himself building his career in what became, after May 1949, the German Federal Republic (West Germany). In 1950/51 he teamed up with Charles Maignal to launch and operate a monthly Franco-German magazine.