Silja Häusermann is Professor of Political Science in the Department of Political Science at the University of Zurich where she studies welfare state politics and party system change in advanced capitalist democracies. She is the author of The Politics of Welfare State Reform in Continental Europe (2010), co-editor of The Politics of Advanced Capitalism (2015), and co-author of Cleavage Formation in the 21st Century: How Social Identities Shape Voting Behavior in Contexts of Electoral Realignment, all with Cambridge University Press. Herbert Kitschelt is George V. Allen Distinguished Professor of International Relations at Duke University where his investigations cover political party competition and citizen-politician linkages. He is the author of The Transformation of European Social Democracy (1994) and co-editor of The Politics of Advanced Capitalism (2015), both with Cambridge University Press.