Historian, expert on diversity, identity and immigration issues, researcher at CNRS ((National Centre for Scientific Research) working in the Communications and Policy Laboratory, Paris-Dauphine University), Co-director of Groupe de recherche Achac (an international network of researchers working on identity, immigration, colonization and urban policy questions), TV and radio columnist (France Inter, Arte, France Info…) member of the think tank Les Gracques and expert on media and diversity issues.