Christian Lahusen holds a Chair of Sociology in the Faculty of Arts at Siegen University, Germany. He studied sociology in Düsseldorf and Madrid and received his PhD from the European University Institute in Florence. His research interests include social theories, political sociology and the sociology of European societies and European integration. Maria T. Grasso is Professor at the Department of Politics, University of Sheffield, UK. She is the author of Generations, Political Participation and Social Change in Western Europe (2016) and co-editor of Austerity and Protest: Popular Contention in Times of Economic Crisis (2015). Her research focuses on political sociology and political engagement.