Born in Ljubljana in 1962. Studied graphic design. Published his first comic, Who Killed the Comics Artist, in 1984. In 1990 took up the pseudonym Ninel, in 1992 quit his job to work on comics full-time. He has published fourteen albums of different genres and is part of the so-called third generation of Slovenian cartoonists: their work is characterized by taboo subjects, social and political satire, eroticism, etc. Sitar is also the foremost Slovenian expert on the theory of comic books: in 2007 he published his lengthy study The History of Slovenian Comics.