This book explains why the level of party presidentialization varies from one country to another. It considers the effects of constitutional structures as well as the party’s original features, and argues that the degree of party presidentialization varies as a function of the party’s genetics.

Carole Bachelot, Assistant Professor in Political Science, Université de Lorraine (laboratoire IRENEE, France Edoardo Bressanelli, Lecturer in European Politics, Department of European and International Studies, King's College London, UK Cristina Bucur, Assistant Professor/Postdoktor, Department of Political Science, University of Oslo, Norway Sergio Fabbrini, Director of the School of Government and Professor of Political Science and International Relations, LUISS Guido Carli University of Rome, Italy Bonnie N. Field, Associate Professor of Global Studies, Bentley University, Massachusetts, USA Anika Gauja, Senior Lecturer and an Australian Research Council Early Career Researcher, Department of Government and International Relations, University of Sydney, Australia Florence Haegel, Full Professor, Sciences Po, Paris, France Richard Hayton, Lecturer in Politics, University of Leeds, UK Timothy Heppell, Associate Professor of British Politics, School of Politics and International Studies (POLIS), University of Leeds, UK Ellis S. Krauss, Professor at the School of International Relations and Pacific Studies, University of California, San Diego, USA Charles Lees, Chair of Politics and Head of the Department of Politics, Languages, and International Studies, University of Bath, UK Iain McMenamin, Associate Professor of Politics, Dublin City University, Ireland Felipe Nunes, Assistant Professor in International Relations and Political Science, University of California, Los Angeles, USA Oreste Massari, Professor of Political Science and Comparative Politics, Sapienza University of Roma, Italy Gianluca Passarelli, Assistant Professor in Political Science at the Department of Political Sciences, Sapienza University of Roma, Italy Robert Pekkanen, Professor at the University of Washington, USA Carlos Ranulfo Melo, Professor and Coordinator of the Center for Legislative Studies, Department of Political Science, Federal University of Minas Gerais, Brazil Thomas Sedelius, Associate Professor in political science, Dalarna University, Sweden Peter M. Siavelis, Professor of Political Science and Director of the Latin American and Latino Studies Program, Wake Forest University, USA