He is the author of Philosophies of Integration: Immigration and the Idea of Citizenship in France and Britain (Palgrave 200,1 2nd edition), and has published widely on migration in Europe, multiculturalism, the integration of immigrants, and EU immigration policy. Adrian is currently working on a book entitled Eurostars and Eurocities (forthcoming, Blackwell 2006), that looks at the impact of free movement in the European Union, through the experiences of foreign resident professionals in Amsterdam, London and Brussels.