David Wiggins was Wykeham Professor of Logic at the University of Oxford from 1993 until his retirement in 2000. Before that, he was Professor at Bedford College, London; Fellow of University College, Oxford; and Professor at Birkbeck College, London. He is the author of Identity and Spatio-Temporal Continuity (Blackwell, 1967), Sameness and Substance (Blackwell, 1980), Needs, Values, Truth (amended 3rd edition Oxford, 2002), Sameness and Substance Renewed (Cambridge, 2001), Ethics: Twelve Lectures on the Philosophy of Morality (Penguin, 2006), and Continuants: Their Activity, their Being, and their Identity (Oxford, 2018).