| Jean-Jacques Laffont [1947-2004] |
| Hervé Ossard | (Director) |
| Jean Tirole | (Scientific Director) |
| Pierre Carli | (IDEI Chairman) |
| Paul Champsaur | (Chairman IDEI-R) |
| Michel Matheu | (Secretary General) |
| Georges Molins-Ysal | (Treasurer) |
| Eric Debroeck | |
| Jacques Lesourne | |
| Alain Quinet |
| Paul L. Joskow | |
| Edmond Malinvaud | |
| John Sutton | |
| Oliver E. Williamson |
| Karine Arcache | (Assistant) |
| Laurent Benvenuti | (Data Processing) |
| Marie-Pierre Boé | (Assistant) |
| Olivier Cavailhes | (Data Processing) |
| Florence Chauvet | (Assistant) |
| Céline Claustre | (European project manager) |
| Delphine Dechelotte | (Assistant) |
| Mélissa Diop | (Accountancy) |
| Marie-Hélène Dufour | (Assistant) |
| Joël Echévarria | (Chief Operating Office) |
| Christelle Fauchié | (Assistant) |
| Carolyne Lamy | (Executive program assistant) |
| Jean-Paul Lesage | (Data Processing) |
| Laurence Liétard | (PA to the directors) |
| Sylvie Lucas | (Direction of Administration and Accountancy) |
| Carole Mete | (Accountancy) |
| Caroline Mondoulet | (Cost controling) |
| Claire Navarro | (Communication) |
| Alexandre Noceto | (Reception, Logistics) |
| Valérie Nowaczyk | (Assistant) |
| Florence Pierrelée | (Recruitment Process of Researchers) |
| Edwige Sauvé | (Library) |
| Valérie Servières | (Communication) |
| Jennifer Stephenson | (Communication) |
| Priyanka Talim | (Recruitment Process of Researchers) |
| Pierrette Vaissade | (Secretary and Library) |