Peter Hupe teaches Public Administration at Erasmus University Rotterdam. In 2012-2013 having been a Visiting Fellow at All Souls College, Oxford, his research focuses on the theoretical-empirical study of the policy process, particularly implementation and street-level bureaucracy. In a longstanding collaboration he and Michael Hill have published articles in Public Administration, Public Management Review and Policy and Politics. With Aurélien Buffat he developed the 'public service gap' as a heuristic tool for comparative research (2014). Michael Hill is Emeritus Professor of Social Policy of the University of Newcastle and a Visiting Professor at the University of Brighton. Having written on many aspects of the policy process and social policy, he is author of The Public Policy Process, Implementing Public Policy (with Peter Hupe), Understanding Social Policy (with Zoë Irving) and editor of Studying Public Policy (2014). In 2009 he was given the Social Policy Association's lifetime award. Aurélien Buffat is Junior Lecturer at the Department of Political Science, University of Lausanne, where he teaches policy analysis. Focused on policy implementation and street-level bureaucracy, he has published articles in Public Management Review and the International Review of Administrative Sciences. With Peter Hupe he has been co-chairing several panels and workshops, thus building up an international network of scholars dedicated to the study of contemporary street-level bureaucracy.