Economist at CEPREMAP, senior researcher (Directeur de Recherche) at National Center for Scientific Research (CNRS), head of the Research Unit (URA 922 : « Régulation, Human Ressources et Public Choice ») Associated to CNRS, professor (Directeur d’Etudes) at l’EHESS (www.ehess.fr ), co-organizer of the Ph-D. program « Institutional Economics » co sponsored by EHESS, University of Paris X-Nanterre, and Ecole Polytechnique, member of the Council of Economic Analysis – 1997-2001. Member of the Scientific Council of the Saint-Gobain Center for Economic Studies. President of the Association Research and Régulation (Recherche et Régulation), in charge of the newsletter « Lettre de la Régulation », and the annual review « Année de La Régulation”.