After studying Applied Arts, while helping his dad in the restoration of old paintings and art objects, he developed a passion for the wild west and an interest in Native Americans. He started to produce some illustrations along that line but his career in comics did not begin until 1974, when he and Laurence Harlé started the western series Jonathan Cartland. These comics, which are among the best of the genre, opened new paths and got him a prix at the 1988 International Angoulême Festival. Meanwhile, Blanc-Dumont continued making illustrations for ads and book covers. His second series, Colby, was also received well. In 1997, at the request of Jean Giraud, he joined the Blueberry creative team. Since then he has worked on more than a dozen volumes dedicated to the mythical character.