He is the author of When States Come Out: Europe's Sexual Minorities and the Politics of Visibility (Cambridge University Press, 2016) and has edited with David Paternotte LGBT Activism and the Making of Europe: A Rainbow Europe (Palgrave, 2014). Other publications have appeared or are forthcoming in Comparative Political Studies, the European Journal of International Relations, the European Political Science Review, the Journal of Human Rights, Mobilization and Perspectives on Europe.