Fiedler worked for the leading publishing houses of Dresden. "B.G. Teubner", "Theodor Steinkopff-Verlag", "Wilhelm-Limpert-Verlag", "Buchdruckerei der Dr. Güntz'schen Stiftung" and "Rudolph'sche Verlagsbuchhandlung" were known nationwide. Fiedler designed books on astronomy for the Dürerbund and the local planetarium. Especially known were his cover illustrations for adventure stories of the famous circus Sarrasani. Some of the books for "Talisman-Bücherei" of Rudolph were banned by the Nazis. They were bound to the New Thought movement.