David Wiggins

• David Wiggins was Wykeham Professor of Logic in the University of Oxford (1994–2000). He was previously (1960–1967) tutorial fellow in philosophy at New College Oxford; Professor of Philosophy at Bedford College, London; Fellow and Praelector at University College, Oxford; and Professor of Philosophy at Birkbeck College, London. He has written Sameness and Substance (1980); Needs, Values, Truth (1987, 1991, 1998, 2002); Sameness and Substance Renewed (2001); Ethics: Twelve Lectures on the Philosophy of Morality (2006).

Tom Stoneham

• Tom Stoneham is Professor of Philosophy at the University of York. He has written Berkeley's World (2002) and several articles on a range of topics from self-knowledge to the possibility of nothing. He is currently working on the metaphysics of reflections and the epistemology of seeing in a mirror.

Denis Corish

• Denis Corish teaches philosophy at Bowdoin College, a major interest of his being what an elaborated theory of time as relative rather than absolute should look like.

Jonathan Webber

• Jonathan Webber is Lecturer in Philosophy at Cardiff University. His research focuses on clarifying and critiquing the psychology implicit in ethical discussion and drawing out the ethical implications of correctly understanding the relevant aspects of ourselves.

Christopher M. Johnson

• Christopher M. Johnson is a doctoral candidate studying ethics at the University of Alberta.

Don S. Levi

• Emeritus Professor, Philosophy Department, University of Oregon, and author of In Defense of Informal Logic. His most recent contribution to Philosophy was ‘Determinism as a Thesis about the State of the World from Moment to Moment’ (July 2007).