Born and raised in Belgium, Morris moved to the United States in 1946 for six years. There, he worked for MAD magazine and met René Goscinny, with whom he collaborated from 1955 until Goscinny's death in 1977. Jean Léturgie co-created the character of Percevan before he began an enduring cooperation with Xavier Fauche that produced eight Lucky Luke titles, followed by the spin-off series Rantanplan (Rin Tin Can) and Kid Lucky. Pearce is a pseudonym for Yann and Conrad - the long-established, iconoclastic duo that created cult series Les Innommables and graced Spirou Magazine with their irreverence for years.