Preface: Special Issue in Honor of the 60th Birthday of Sylvain Sorin.

Summary We have the immense pleasure of editing this special issue in honor of Sylvain Sorin. It follows the international conference GameS and StrategY in PariS,'' organized by the French school of mathematical game theory, that was also held in his honor. The conference took place at the Institut Henri Poincaré (IHP) in June 2012, included 21 plenary talks and attracted more than 150 participants.