Tobie Nathan is a Professor of clinical and pathological Psychology (University of Paris 8). Author of numerous books, including several novels, he has recently published La nouvelle interprétation des rêves (Odile Jacob, 2011). Isabelle Stengers is a Professor of philosophy at the free University of Brussels. She has published Au temps des catastrophes. Résister à la barbarie qui vient (Les Empêcheurs de penser en rond, 2009). Together, they have published Nous ne sommes pas seuls au monde. Les enjeux de l’ethnopsychiatrie (re-ed. Points, 2007).