Kathleen Thelen is Ford Professor of Political Science at MIT and a permanent external member of the Max Planck Institute for the Study of Societies in Cologne, Germany. She is the author, among other works, of Varieties of Liberalization and the New Politics of Social Solidarity (2014) and How Institutions Evolve (2004), and co-editor of Advances in Comparative Historical Analysis (with James Mahoney, 2015), and Beyond Continuity (with Wolfgang Streeck, 2005). Thelen has served as President of the American Political Science Association (APSA), Chair of the Council for European Studies, and as President of the Society for the Advancement of Socio-Economics.