Christian Lahusen is Professor of Sociology at the Department of Social Sciences, Faculty of Arts at the University of Siegen, Germany. His research is devoted to the analysis of social problems and social exclusion, political behavior and social movements, and to the sociology of European integration.
Marco Giugni is Professor in the Department of Political Science and International Relations and Director of the Institute of Cititzenship Studies (InCite) at the University of Geneva, Switzerland. His research interests include social movements and collective action, immigration and ethnic relations, unemployment and social exclusion.