He studied Engineering in Leipzig, but later he moved to the Academy of Fine Arts in Berlin; in the meantime he had a boxing career which led him to win a German title.
He also drew "Aeroporto Z" and "Will Sparrow" for Donald Duck and Other Adventures (Paperino e altre avventure).
During World War II Caesar was in Morocco, Libya and Spain, and, in 1941, again in Africa as interpreter for Erwin Rommel.
Caesar then moved to other popular magazine-book series for the same publisher, Arnoldo Mondadori Editore, I Gialli and Segretissimo.
Other series he worked to include the unsuccessful Italian science fiction magazines Oltre il Cielo and Cronache del Futuro, and the German Perry Rhodan.