Jean-Louis Janssens studied decorative arts as well as graphic arts. After his studies, he went to work in the communication field. He is one of the main writers of humorous comics for Spirou from 1993. He began with several short stories for artists like Olis, David Deth, Bercovici and Gazzotti. In 1994, he began the superhero parody 'Cosmic Patrouille' with artist Mauricet, as well as 'Les Maîtres du Monde' with Olivier Saive. A year later, he wrote 'Nationale Zéro' for Éric Maltaite and 'Télé-Emplettes' with Fabrizio Borrini. From 2000, he helps Serge Ernst with the scenario-writing of the series 'Les Zappeurs'. In 2001, he created the gag strip 'Charlotte', for which he also does the artwork. At the same time, he does illustration work for Bayard Presse and Le Journal de Mickey.