On occasion of the World Advertising Congress 1929 in Berlin, Fiedler was awarded for his poster design. Some important posters were "Hiertstein - Katzenstein Gebiet", "Riesen-Auftakt 43. Bundesfest Bund Deutscher Radfahrer" for the German Cycling Federation, and "200 Jahre Dresdner Anzeiger" on occasion of the jubilee of the first newspaper of Dresden. After 1930 Fiedler became known for some of his drawings, especially of children.