• Paris Game Theory Seminar, from October 2002 to July 2018.
• X-HEC Economics Seminar, 2008-2009 (organized with Alfred Galichon and Tristan Tomala).
• Journées du Laboratoire d’Econométrie de l’Ecole Polytechnique 2002-2009.
• Workshop Advances in Game Theory, 21-22 septembre 2009, Ecole Polytechnique (organized with Jérôme Renault and Tristan Tomala).
• Workshop Stochastic Methods in Game Theory, september 8-16, 2010, Erice, Italy (organized with Marco Scarcini, Eilon Solan and Nicolas Vieille).
• International Conference Mathematical Aspects of Game Theory and Applications, september, 12-16, 2011, Toulouse, France (organized with Marc Quincampoix, Jérôme Renault, Sylvain Sorin, Tristan Tomala and Xavier Venel).
• Games and Strategy in Paris. International Conference for Sylvain Sorin sixties. Institut Henri Poincaré, June 11-13, 2012 (organized with Dinah Rosenberg, Tristan Tomala, Vianney Perchet, Guillaume Vigeral and Yannick Viossat).
• Internationale Conference on Game Theory, State University of New York at Stony Brook, July 15-19 2012 (organized with Tristan Tomala).
• Celebration in honor of Michel Balinski’s 78 years, State University of New York at Stony Brook, July 17-18 2012 (organized with Zari Rachev).
• International Conference Mathematical Aspects of Game Theory and Applications, June 30 to July 4 2014, Roscoff, France (organized with R. Buckdahn, Pierre Cardaliaguet, Marc Quincampoix, Christin Rainer, Jérôme Renault, Tristan Tomala, Nicolas Vieille).
• Faire Decisions: In Celebration of Michel Balinski's 2013 von Neumann Theory Prize, February 11, 2014, Ecole Polytechnique, France.
• Stream organizer of five sessions on Dynamic and Repeated Games, 20th Conference of the International Federation of Operational Research Societies, IFORS 2014, July 13-18, Barcelona.
• Journée des Anciens Théoriciens du Laboratoire d'Econométrie de l'Ecole Polytechnique, 8 Octobre 2015.
• Journée SMAI-MODE : Optimisation, Jeux et Economie, Institut Henri Poincaré, May 18, 2017 (organized with Philippe Bich and Guillaume Carlier).
• D-TEA 2017, IHP, May 29-31. Year's theme: Voting (organized with Itzhak Gilboa and his colleagues at HEC Paris).
• D-TEA 2018, IHP, May 23-25. Year's theme: Modes of Decision Making (organized with Itzhak Gilboa and his colleagues at HEC Paris).
• 8 Juin 2018: Journée MODE-ROADEF sur l'optimisation dans les réseaux.
• In 2018 and 2019: Liverpool Economic Theory and Computation Workshop.
• D-TEA 2019. PSE, June 3-5. Year's theme: Ambiguity, (organized with Itzhak Gilboa and his colleagues at HEC Paris).
• December 3-4, 2019. International Conference on Mathematical Optimization for Fair Social Decisions: A tribute to Michel Balinski (organized with Mourad Baiou).
• D-TEA 2020. PSE, June 16-19 (online via zoom). Year's theme: Prospect Theory, (organized with Itzhak Gilboa and his colleagues at HEC Paris).
• Nobel Symposium: One Hundred Years of Game Theory. Stockholm, December 17-19 2021, (organized with Jorgen Weibull, Roger Myerson, Yukio Koriyama, Tommy Andersson and Mark Voorneveld).
• D-TEA 2022, PSE. Year's theme: complexity (organized with Itzhak Gilboa and his colleagues at HEC Paris).
• MATHS EN MOUVEMENT 2022, Mathématiques et démocratie : le vote à la loupe (IHP).
• D-TEA 2023, IHP. Year's theme: Language and Representation (organized with Itzhak Gilboa and his colleagues at HEC Paris).
• D-TEA 2024, IHP. Year's theme: In memoriam of Prof. Daniel Kahneman (organized with Itzhak Gilboa and his colleagues at HEC Paris).
•, January 2024. Game Theory Days: Moroccan Center for Game Theory, UM6P.
•, January 2024. Winter School on Data Economics: Moroccan Center for Game Theory, UM6P. (organized with Jason Hartline and Bo Waggoner)