Emmanuel Lazega is Professor of Sociology at the University of Paris-Dauphine. He is the author of Micropolitics of Knowledge (Aldine-de Gruyter 1992), The Collegial Phenomenon: The Social Mechanisms of Cooperation among Peers in a Corporate Law Partnership (Oxford 2001) and joint editor, with Olivier Favereau, of Conventions and Structures in Economic Organization: Markets, Networks and Hierarchies (Edward Elgar 2002). He is a member of the editorial boards of the Revue Française de Sociologie, Social Networks and International Sociology. His current research is on social control of business. Email: emmanuel.lazega@ens.fr