Most famous for his work on the Avant l'Incal and The Technopriests comic book series, Janjetov is also known as the lead singer of the 1980s rock band Heroina.
After studying art at the University of Novi Sad in Serbia's Vojvodina province, he worked on a comic strip called Bernard Panasonik.
In the mid 1980s, the French cartoonist Jean Giraud (also known as Moebius) selected Janjetov as his replacement artist for The Incal series.
He was born in Subotica, Serbia to an architect father.
He collaborated with writer and director Alejandro Jodorowsky on both The Technopriests and Avant l'Incal.