After completing his studies at Institut Saint-Luc in Tournai, Dermaut (1949) moved to Paris in 1971. His career in comics began three years later, when he joined the publishing house Fleurus. Under the pseudonym Franjack, he illustrated a comic adaptation of Oliver Twist for Djin, and soon started working for other publications (Formule 1, Fripounet, Le Journal de Tintin, Okapi). In 1982, he started a collaboration with scriptwriter Daniel Bardet, illustrating ‘Les Chemins de Malefosse’, a popular realistic historical comic about the turbulent years of the late 16th century, when the French throne was claimed by Henry of Navarre, later known as Henry IV.