Jean-Louis Floch, the older brother of comics artist Jean-Claude Floc'h, initially pursued a juridical career. However, he also turned to comics, starting out at Bayard Presse in 1977. Together with Colette Tournès, he drew the first pages of the 'Jacopo' series in the pilot issue of Charabia. The series eventually had its real launch in Astrapi a year later. For a more adult public, Floch cooperated with writer Jean-Luc Fromental on some comics for Métal Hurlant ('En Pleine Guerre Froide'). In addition, he was active as an illustrator for the press and several publishers.
In 1984, he took on an experimental comic between the boundaries of comic art and painting in Hebdo des Savanes. He also continued to work for Astrapi, this time with the 'Prince Ludo' series. He was also active for the Italian graphic magazine Dolce Vita ('Monsieur Midi' with writer Dionnet), and published the album 'Une Ville n'est pas un Arbre' at Les Humanoïdes Associés. From 1989 onward, Jean-Louis Floch has created several works for L'Écho des Savanes, including 'Mort aux Autres'.