Frank Adloff, born in 1969, is a professor of sociology at UniversitÃĪt Hamburg and the co-director of the Humanities Centre for Advanced Studies ÂŧFutures of SustainabilityÂŦ. His research focuses on social theory, social-ecological transformations, conviviality, and civil society. Alain CaillÃĐ, born in 1944, holds a doctorate in economics and is professor emeritus of sociology at the UniversitÃĐ Paris Ouest-Nanterre La DÃĐfense. He has directed the journal La Revue du MAUSS (Mouvement anti-utilitariste en science sociale) since its foundation in 1981 and is a central player in the convivialist movement.