A. Ridha Mahjoub is Professor of Operations Research and Combinatorial Optimization at the Paris-Dauphine University, France and member of the LAMSADE laboratory CNRS. His research areas include the theory and applications of polyhedral approaches for solving large NP-hard combinatorial optimization problems, linear and integer programming, network design as well as complexity and graph theory. His publications have appeared in numerous leading journals and he serves as Associate Editor for the journal RAIRO-Operations Research.