Řezníček worked first with industrial designers before becoming a contributor to the journals Jugend, Simplicissimus und Fliegende Blätter.
He first became well known by cartoons for Fliegende Blätter, and vignette designs for programmes and book decoration.
The name is derived from a parody in the Munich magazine Fliegende Blätter of 1848 by Ludwig Eichrodt and Dr. Adolph Kussmaul of two poems by Joseph Victor von Scheffel, "Biedermanns Abendgemütlichkeit" ("Biedermann's Evening Comfort") and "Bummelmaiers Klage" ("Bummelmaier's Complaint")