Research Professor of Political Science and Public Policy and General Secretary of the International Public Policy Association, I'm working on Policy-making with specific attention to the role of knowledge and its political dimension and with a pragmatist and Constructivist Approach. I have developed empirical research on housing policy, environmental policy, energy policy and more recently economical policy. I wrote 11 books, a large number of articles and chapters. My last books are "L'Etat sous Pression, Enquête sur l'interdiction française du gaz de schiste" (avec Sebastien Chailleux), The political formulation of Policy Solutions, Arguments, Coalition, Arenas (with Frank Fischer and Nikolaos Zahariadis), The meaning struggles of Policy