Patrice Langlois, Professor in the Department of Geography and director of the MTG (Modeling and Graphic process in Geography) team, has been a teacher-researcher at the University of Rouen since 1982. He specializes in modeling in geography and in the development of data-processing tools for geographers, thematic cartography coupled with data processing, and the automatic digitization of vector maps. A general study of the structures and concepts of geographic modeling has led him to develop an integrated platform (framework) of modeling and simulation of spatial dynamics, based on a language of rules coupled with graphical modeling.