Luis Cabrera is Reader in Political Theory at the University of Birmingham (UK). His academic research focuses on institutional changes above the nation-state to promote the protection of human rights. His most recent book, The Practice of Global Citizenship (2010), was awarded the 2011 Yale H. Ferguson Award from the International Studies Association-Northeast. His current book project, The Possibility of Global Political Community, explores some of the means of appropriately balancing respect for fundamental rights with sensitivity to diversity under democratic rule, from the local to the global level. a.l.cabrera@bham.ac.uk

Simon Caney is Professor in Political Theory at the University of Oxford and a Fellow and Tutor at Magdalen College. He is the author of Justice Beyond Borders (2005) and has published widely on contemporary political philosophy. He is a coeditor of Climate Ethics (2010) and was also a member of the working party that wrote the Nuffield Council on Bioethics report Biofuels: Ethical Issues (2011). His current research interests are primarily in environmental, global, and intergenerational justice. He is currently completing two books: Global Justice and Climate Change (with Derek Bell) and On Cosmopolitanism. simon.caney@magd.ox.ac.uk

Keith Horton is Lecturer in Philosophy at the University of Wollongong, Australia. He has written a number of articles on the moral implications of world poverty and related themes, and coedited three books: Ethical Questions and International NGOs (with Chris Roche, 2010), Global Ethics: Seminal Essays (with Thomas Pogge, 2008), and Globalisation and Equality (with Haig Patapan, 2004). He is also a cofounder and board member of Academics Stand Against Poverty. khorton@uow.edu.au

Martin Kirk is Head of UK Campaigns for Oxfam GB and is responsible for delivering Oxfam's campaigns across England, Scotland, and Wales. Before joining Oxfam, Kirk was Head of Global Advocacy for Save the Children UK, where he oversaw the international advocacy agenda. Previously, he worked for a private management consultancy to advise regional health authorities on developing health promotion strategies, and chaired a grassroots health promotion lobbying network on a voluntary basis. MKirk@oxfam.org.uk

Onora O'Neill, Baronness O'Neill of Bengrave, is a member of the UK House of Lords. She is a professor of philosophy at Cambridge University, and has written widely on such topics as political philosophy and ethics, international justice, and bioethics. Her books include Rethinking Informed Consent in Bioethics (with Neil Manson, 2007), Autonomy and Trust in Bioethics (2002), Bounds of Justice (2000), Towards Justice and Virtue (1996), Constructions of Reason: Explorations of Kant's Practical Philosophy (1989), Faces of Hunger: An Essay on Poverty, Development, and Justice (1986), and Acting on Principle (1975). oon20@cam.ac.uk

Thomas Pogge is Professor of Philosophy and International Affairs at Yale University, Research Director in the Centre for the Study of Mind in Nature at the University of Oslo, and Adjunct Professor in the Centre for Professional Ethics at the University of Central Lancashire. His books include World Poverty and Human Rights: Cosmopolitan Responsibilities and Reforms (second edition, 2008), Freedom from Poverty as a Human Right: Who Owes What to the Very Poor? (editor, 2007), John Rawls: His Life and Theory of Justice (2007), and Realizing Rawls (1989). thomas.pogge@yale.edu

Roger C. Riddell, a Non-Executive Director of Oxford Policy Management, has worked on development issues for nearly forty years. From 1984 to 1999 he was a Research Fellow at the Overseas Development Institute, London, and from 1999 to 2004 served as International Director of Christian Aid. He worked for many years in Zimbabwe, where he conducted the first urban poverty study in that country in the early 1970s, was Chief Economist to the Confederation of Zimbabwe Industries from 1981 to 1983, and chaired the first Presidential Economic Commission of Independent Zimbabwe (1980–1981). He has an undergraduate honors degree in economics (University of Zimbabwe), a Master's in development studies (University of Sussex, Institute of Development Studies), and a diploma in pastoral theology (Heythrop College, University of London). His most recent book is Does Foreign Aid Really Work? (2008). rriddell@waitrose.com