Jules or "Julio" Radilovic, who uses the pseudonym Jules, began his career in 1952, making the comic 'Neznanac' for Horizontov Zabavnik. A couple of years later, he began working for the German market, where he teamed up with writer Zvonimir Furtiner to make a series about inventions and discoveries ('Izumi i Otkrica') for Kunterbunt, a publication by Rolf Kauka. They also began the historical comic 'Through the Past Centuries', that ran in the Yugoslavian magazine Plavi Vjesnik until 1959.

In the early 1960s, Jules illustrated four episodes of 'Captain Leshi', a series based on a Yugoslavian movie about an Albanian war hero. In 1962, he adapted the Edgar Wallace novel 'Sanders of Africa' to comics, again in cooperation with Furtinger. The Radilovic-Furtinger tandem also started the detective parody 'Herlock Sholmes', that ran successfully in among others Plavi Vjaesnik until 1972. Radilovic joined the Strip Features Syndicate and began series like 'Baca Izvidjac', 'Africke Pustolovine' and 'Jaimee McPheeters', published in magazines like Plavi Vjesnik and Studio (scripts by Furtinger or Norbert Neugebauer). During this period, he also illustrated a great number of book covers and did advertising assignments. Ten books of Tarzan are his the most popular work on illustrating books.

In 1977, he started the World War II series 'De Partizanen' with scripts by Dordge Lebovic for the Dutch magazine Eppo. Although Radilovic and Lebovic never met in person, they continued the strip until 1989. Radilovic was the president of the union of Yugoslav comics artists and was awarded for his achievements in the field with the Danica, the highest Croatian decoration.