Jason Brennan is Assistant Professor of Business and Philosophy at Georgetown University. He was previously Assistant Professor of Philosophy at Brown University. He is the author of The Ethics of Voting (2011), the coauthor with David Schmidtz of A Brief History of Liberty (2010), and the author of a variety of articles on democratic theory, voting ethics, the epistemology of philosophy, and other issues in moral and political philosophy. He is currently working on a liberal, extra-political conception of civic virtue, as well as on a book-length project on political competence and the right to rule.

Christopher W. Morris is Professor of Philosophy at the University of Maryland. He is the author of An Essay on the Modern State (2002) and the editor of Amartya Sen (2009), a recent collection of papers on the work of philosopher and economist Amartya Sen. Professor Morris's interests range over topics in moral, political, and legal philosophy, as well as the theory of practical rationality.

John Tomasi is Professor of Political Science and Philosophy at Brown University, where he is Founding Director of The Political Theory Project. He has held appointments at Princeton University, Stanford University, and Harvard University. Professor Tomasi has been developing a hybrid theory of liberalism that combines a commitment to private economic liberty with a concern for social justice. He presents his theory in Free Market Fairness: A Democratic Defense of Capitalism (forthcoming 2012).

Lloyd P. Gerson is Professor of Philosophy at the University of Toronto. He is the author, coauthor, editor, and translator of about twenty books in ancient Greek philosophy, mainly on Plato, Aristotle, Hellenistic philosophy, and Plotinus. A longstanding interest in political philosophy is currently coming to fruition in a book on the normative foundation of international relations.

Donald C. Hubin is Professor and Chair of the Philosophy Department at The Ohio State University. Professor Hubin specializes in ethics, philosophy of law, and political philosophy. He currently has two primary research interests: first, the nature of practical rationality and the relationship between morality and rationality; and, second, the nature and basis of parental rights and responsibilities. He has authored many articles on these topics in journals such as Analysis, The Journal of Ethics, The Journal of Philosophy, The Journal of Law and Family Studies, and The Cornell Journal of Law and Public Policy.

Fernando R. Tesón is the Tobias Simon Eminent Scholar at Florida State University College of Law. A native of Buenos Aires, he is known for his scholarship relating political philosophy to international law (in particular his defense of humanitarian intervention), and his work on political rhetoric. He has authored Humanitarian Intervention: An Inquiry into Law and Morality (3d ed., 2005), Rational Choice and Democratic Deliberation [with Guido Pincione] (2006), A Philosophy of International Law (1998), and many articles in law, philosophy, and international relations journals and edited collections. He is currently working on a book on global justice with Loren Lomasky of the University of Virginia. Before joining Florida State in 2002, he taught for seventeen years at Arizona State University. He has served as a visiting professor at Cornell Law School, Indiana University School of Law, University of California Hastings College of Law, the Oxford-George Washington International Human Rights Program, and the Universidad Torcuato Di Tella, Buenos Aires.

Matt Zwolinski is Associate Professor of Philosophy at the University of San Diego, and Co-Director of the University's Institute for Law and Philosophy. His current research interests are in the intersection of ethics, law, and economics, with two specific areas of focus. The first involves the proper understanding and normative status of liberty and political libertarianism. The second concerns the nature of exploitation and its moral significance for individual ethics and political institutions. He has recently published articles dealing with the ethics of sweatshop labor, the significance of the separateness of persons for liberal political theory, the morality of price gouging, and the relationship between classical liberal thought and the universal basic income. He is currently completing work on a book entitled Exploitation, Capitalism, and the State.

Steven Wall is Professor of Philosophy at the University of Arizona, where he is also a member of the Freedom Center. Before beginning work at the University of Arizona, he taught philosophy at Kansas State University, Bowling Green State University, and the University of Connecticut. He is the author of Liberalism, Perfectionism and Restraint (1998), and the editor of Perfectionism and Neutrality [with George Klosko] (2003) and Reasons for Action [with David Sobel] (2009).

Christopher Heath Wellman is Professor of Philosophy at Washington University in St. Louis and Professorial Fellow of the Centre for Applied Ethics, Charles Sturt University. He works in ethics, specializing in political and legal philosophy. His most recent books include A Liberal Theory of International Justice [with Andrew Altman] (2009) and Debating the Ethics of Immigration: Is There a Right to Exclude? [with Phillip Cole] (forthcoming 2011).

Michael S. Moore holds the Walgreen University Chair and is Professor at the Center for Advanced Studies at the University of Illinois. He is also Professor of Law and Professor of Philosophy at the University of Illinois. His previous appointments have included chairs in law and in philosophy at the University of Pennsylvania, the University of Southern California, and the University of California at Berkeley. He has written extensively in the areas of psychiatry, philosophical psychology, and the philosophy of mind, as well as in legal and political philosophy. From 2007 through 2010 he was a member of the Project on Law and Neuroscience sponsored by the MacArthur Foundation, serving as co-chair of the Responsibility Research Working Group. His most recent book is Causation and Responsibility: An Essay in Law, Morals, and Metaphysics (2009).

Andrew Altman is Professor of Philosophy at Georgia State University and Director of Research for the Jean Beer Blumenfeld Center for Ethics. Professor Altman is the author of Critical Legal Studies: A Liberal Critique (1990), Arguing About Law: An Introduction to Legal Philosophy (2000), and A Liberal Theory of International Justice [with Christopher Heath Wellman] (2009). He has also authored many articles in legal and political philosophy, including essays that have appeared in Philosophy and Public Affairs, Ethics, Legal Theory, and in previous issues of Social Philosophy and Policy.

Gerald Dworkin is Distinguished Professor of Philosophy at the University of California, Davis. He is currently a Visiting Scholar at the Department of Bioethics at the National Institutes of Health. He has written extensively on autonomy, paternalism, physician-assisted suicide, and the limits of the criminal law. He is the author of Euthanasia and Physician-Assisted Suicide (with R. G. Frey and Sissela Bok, 1998) and The Theory and Practice of Autonomy (1988), and is the editor of Mill's On Liberty: Critical Essays (1997); Morality, Harm, and the Law (1994); Markets and Morals (with Gordon Bermant and Peter G. Brown, 1977); The I.Q. Controversy: Critical Readings (with N. J. Block, 1976); and Ethics (with Judith J. Thomson, 1968).

Anthony O'Hear is Professor of Philosophy at the University of Buckingham and Director of The Royal Institute of Philosophy. He has served as a senior advisor to five British Secretaries of State for Education. His books include Beyond Evolution: Human Nature and the Limits of Evolutionary Explanation (1997), The Great Books: A Journey through 2,500 Years of the West's Classic Literature (2008, 2009), The Landscape of Humanity: Art, Culture, Politics (2008), and The School of Freedom: A Liberal Education Reader from Plato to the Present Day [with Marc Sidwell] (2009). He is also editor of the journal Philosophy.