In 1999, he began the series Ariol, written by Marc Boutavant, which originated in the children's magazine J'aime lire.

Guibert became associated with the magazine Lapin and L'Association[3] (alongside Frédéric Boilet, Émile Bravo, Fabrice Tarrin, Christophe Blain, and Joann Sfar), which marked an evolution of his work to the service of real-life stories.

During this same period, he created several series, including Sardine de l'espace, Les Olives noirs, and La Fille du professeur ("The Professor's Daughter") (with Joann Sfar).

[6] After being a finalist for the Grand Prix de la ville d'Angoulême in 2019, he was finally elected by the authors during the festival the following year.

[8] In January 2023, Gubert was elected member of the engraving and drawing section of the Academy of Fine Arts.