Gunzigs childhood was heavily marked by his dyslexia . After difficult school years, he still achieved a degree in political science. In 1993 he made his debut as a writer with “Situation instable penchant vers le mois d’août”, and meanwhile he has written twenty books. He is also a professor of literature, he writes plays, columns for radio, television and newspapers, and even songs.
In 2001 he became the laureate of the Prix Victor-Rossel with his debut novel “Mort d'un parfait bilingue”. In 2013 and 2014 he wrote with Jaco Van Dormael the script for his film “Le Tout Nouveau Testament”.