Gérald Bronner is a professor of sociology at the University of Paris, member of the French Academy of Technologies and the French National Academy of Medicine. His work focuses on collective beliefs, errors of reasoning and their social consequences. He has published several books on these issues, including “L’empire des croyances“ (Puf, Paris, 2003), which was awarded a prize by the French Academy of Moral and Political Sciences, and “La démocratie des crédules“, for which he has received numerous prizes (Prix de la revue des deux Mondes, Prix Sophie Barluet CNL, Prix de l’Union rationaliste, Prix des Lumières). His book “La pensée extrême – Comment des hommes ordinaires deviennent des fanatiques“ (Puf, Paris, 2016) received the prestigious EUROPEAN AMALFI PRIZE for Sociology and Social Sciences.