A French writer and philosopher, Hadjadj was born in Nanterre to Jewish parents of Tunisian heritage in 1971. In his teens he was an atheist and anarchist, and he maintained a nihilistic attitude for most of his twenties until, in 1998, he converted to Catholicism. His book Réussir sa mort: Anti-méthode pour vivre, won the Grand Prix catholique de littérature in 2006. Currently Hadjadj teaches philosophy and literature in Toulon. He is married to the actress Siffreine Michel and is the father of four daughters and one son.