Xavier Guillaume is lecturer in International Relations at the University of Edinburgh. He recently published International Relations and Identity (Routledge 2011), which engages theoretically and empirically the question of identity formation from an international perspective through the example of the question of multiculturalism in Japan from the mid-sixteenth century to the mid-twentieth, and co-edited with Jef Huysmans Citizenship and Security (Routledge 2013), which focuses on questions of citizenship in security analysis in order to critically evaluate how political being is and can be constituted in relation to securitising practices.