Catherine E. De Vries is Professor of Political Science at Bocconi University. She is the author of two books on European politics, including Euroscepticism and the Future of European Integration (OUP, 2018) and Political Entrepreneurs (Princeton UP, 2020).

Sara B. Hobolt is the Sutherland Chair in European Institutions and professor at the London School of Economics and Political Science. She is the author of four books on European politics, including Europe in Question (Oxford UP, 2009), Blaming Europe? (Oxford UP, 2014) and Political Entrepreneurs (Princeton UP, 2020).

Sven-Oliver Proksch is Professor of Political Science and Chair for European and Multilevel Politics at the University of Cologne. His research interests include political representation in Europe, party politics, parliamentary debates, and political text analysis.

Jonathan B. Slapin is Professor of Political Science and Chair for Political Institutions and European Politics at the University of Zürich. His current research focuses on European parliamentary and party politics, and his most recent book is Roll Call Rebels (CUP, 2019).