Thomas Pogge is professor of philosophy and international affairs at Yale University, research director in the Center 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 Realizing Rawls (1989), John Rawls: His Life and Theory of Justice (2007), and World Poverty and Human Rights: Cosmopolitan Responsibilities and Reforms (second edition, 2008). He recently edited Freedom from Poverty as a Human Right: Who Owes What to the Very Poor? (2007).

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 prize from the International Studies Association-Northeast. His current book project, The Possibility of Global Political Community, explores some means of appropriately balancing respect for fundamental rights with sensitivity to diversity under democratic rule, from the local to the global level.