Cyril Liéron has been working as a colorist since 1995. He has contributed to various well-known comics, including Percevan, L'Arcantane Noire, Le Maître des Étoiles, Barbe Rouge (Dargaud), Red Label Voodoo (Soleil), Cotton Kid, Coyote Noir (collective) (Vents d’Ouest), Le Bras de Fer, La Maison Piège (Dupuis), and Alan (1, 2, 3, and 4) (Jos le Douaré). Dans la tête de Sherlock Holmes (Inside the Head of Sherlock Holmes), published by Ankama, marks Cyril's debut as a comic scriptwriter.
Benoit Dahan is a scriptwriter, illustrator, and colorist living in Paris. After studying Graphic Arts at ESAG, he began his career in press illustration, contributing to Le Monde, Libération, Le Point, Science et Vie Junior, and more. He has also illustrated children's books. Psycho-Investigateur is his first comic book series, created in collaboration with his friend Erwan Courbier.