an expert in Urban Policies, is full professor of Planning and director of the Master in Urban Planning and Design at the Urban School, SciencesPo, Paris. He received a Marie Curie Fellowship in 1996 and a Fulbright grant in 2003. His research focuses on a comparative approach to large urban projects in cities from different countries. He has been recently working on a few major projects dealing with the changing spatial organization of European cities and their consequent impacts on urban policies: the presence of immigrants in small Italian municipalities. He published or edited 12 books and several papers on housing, urban planning, and the European Union programs for cities. Among the latest: (2016: dir.), Rapporto sulle città, Metropoli attraverso la crisi, il Mulino, Bologna; (2015: co-dir.), Métropoles et régions, entre concurrences et complémentarités. Regards croisés France, Italie, Planum.