Dr. Nickel teaches and writes in political philosophy, philosophy of law, and human rights law and theory.  He is the author of Making Sense of Human Rights (2nd ed. 2006) and many articles in philosophy and law.  Recent articles include "Rethinking Indivisibility: Towards a Theory of Supporting Relations between Human Rights," "Who Needs Freedom of Religion?" and "Are Human Rights Mainly Implemented by Intervention"?  During 2008-09 Nickel was Visiting Professor at Georgetown University Law Center.  From 2003-08 he was Professor of Law at Arizona State University.  From 1982-2003 Nickel was Professor of Philosophy at the University of Colorado where he served as Director of the Center for Values and Social Policy (1982-88) and as Chair of the Philosophy Department (1992-1996).

Dr. Siegel has held visiting professorships at Berkeley, Stanford, the University of Amsterdam, and the University of Groningen. His research interests are in philosophy of science, epistemology, and philosophy of education. He is especially interested in issues concerning rationality, relativism and naturalism. He has published over 150 papers in journals including Philosophy of Science, British Journal for Philosophy of Science, Studies in History and Philosophy of Science, Philosophy and Phenomenological Research, Synthese, The Monist, Analysis, and Metaphilosophy, and three books: Relativism Refuted (Kluwer, 1987), Educating Reason (Routledge, 1988), and Rationality Redeemed? (Routledge, 1997). He is the editor of The Oxford Handbook of Philosophy of Education (Oxford University Press, 2009).

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