Thomas Williams is the Isabelle A. and Henry D. Martin Professor of Medieval Philosophy at Georgetown University. He has published widely on medieval philosophy and theology. He is co-author of Anselm (2008), editor of The Cambridge Companion to Medieval Ethics (2018) and The Cambridge Companion to Duns Scotus (2003), and translator of Augustine: Confessions (2019), John Duns Scotus: Selected Writings on Ethics (2017), Thomas Aquinas: The Treatise on Happiness and Treatise on Human Acts (2016), and Anselm: The Complete Treatises with Selected Letters and Prayers and the Meditation on Human Redemption (2022).