Martin O'Neill is Lecturer in Political Philosophy in the Department of Politics at the University of York. He has previously been Hallsworth Research Fellow in Political Economy at the University of Manchester, a Research Fellow in Philosophy and Politics at St John's College, University of Cambridge, and a Hoover Fellow in Economic and Social Ethics at the Université catholique de Louvain. He is co-editor (with Shepley Orr) of a forthcoming book, Taxation and Political Philosophy.

Thad Williamson is Associate Professor of Leadership Studies and Philosophy, Politics, Economics and Law, University of Richmond. He is the author of Sprawl, Justice and Citizenship: The Civic Costs of the American Way of Life, co-author (with Gar Alperovitz and David Imbroscio) of Making a Place for Community: Local Democracy in a Global Era, and co-editor (with Douglas Hicks) of the upcoming Leadership and Global Justice.