Christine L'Heureux is the founder of Chouette Publishing and the cocreator of Caillou. She is the author of several books, including Caillou: Good Night , Caillou: Play with Me , and Caillou: Rosie's Pacifier . Pierre Brignaud is the illustrator of all the Caillou titles in the Hand in Hand series, Step by Step series and Baby Caillou. Francine Nadeau is a child psychologist who taught developmental psychology of children and the family at Université de Sherbrooke. She has been collaborating on many Caillou series such as Step by Step or Hand in Hand . They all live in Montreal, Quebec.