Simon Blackburn

• Simon Blackburn is the Professor of Philosophy at the University of Cambridge, and a Research Professor at the University of North Carolina, Chapel Hill. He has written prolifically on issues in the philosophy of language, epistemology, meta-ethics, and metaphysics. His books include Spreading the Word, Ruling Passions, Essays in Quasi-Realism, and many others.

Amelie Rorty

• Amelie Rorty is a Visiting Professor at Boston University, a Lecturer in the Department of Global Health and Social Medicine at the Harvard Medical School and a member of the Ethics Committee at Mt. Auburn Hospital. She's the author of Mind in Action and editor of Explaining Emotions; The Many Faces of Philosophy; The Many Faces of Evil and Philosophers on Education. She is presently working on On the Other Hand: A Plea for Ambivalence.

Garrath Williams

• Garrath Williams is Lecturer in Philosophy at Lancaster University, UK. He has written on Kant, Hobbes, and Hannah Arendt, on institutions and responsibility in liberal societies, as well as in applied ethics. He is currently completing a book on moral responsibility.

Sophie Allen

• Sophie Allen is a lecturer in Philosophy at the University of Oxford, currently based at St. Peter's College. In addition to being troubled by the nature of meaning, she is interested in the Philosophy of Science, Mind and Metaphysics and the relationship between them. Of particular interest are the connections between scientific and metaphysical realism, a subject upon which she has previously published in Philosophy.

Nick Zangwill

• Nick Zangwill is Professor of Philosophy at Durham University, and the author of The Metaphysics of Beauty and Aesthetic Creation, as well as many articles on metaethics and the philosophy of mind.

Timothy Chappell

• Timothy Chappell is Professor of Philosophy at The Open University, and Director of The Open University Ethics Centre. He is also a Visiting Fellow in the Departments of Philosophy at the University of St Andrews. His most recent books are Ethics and Experience (Acumen 2009) and The Moral Problem of Demandingness (Palgrave 2009). His book The Philosophy of Religion is forthcoming as part of the new Open University second-level course Exploring Western Philosophy.

Graham Priest

• Graham Priest is Boyce Gibson Professor of Philosophy at the University of Melbourne, Distinguished Professor of Philosophy at the Graduate Center, City University of New York, and Arché Professorial Fellow at the University of St Andrews. His books include In Contradiction, Beyond the Limits of Thought, Towards Non-Being, and Doubt Truth to be a Liar.