Robert Audi writes, lectures, and teaches in ethics and political philosophy, epistemology, and action theory. He has published books and papers in these and other areas. His OUP books include The Architecture of Reason (2001), Democratic Authority and the Separation of Church and State (2011), Rationality and Religious Commitment (2011), Means, Ends, and Persons (2015), and Rational Belief (2015). He is a past president of the American Philosophical Association, Editor-in-Chief of The Cambridge Dictionary of Philosophy (1995, 1999, and 2015), and a Fellow of the American Academy of Arts and Sciences.

David Phillips is Professor and Chair of the Department of Philosophy at the University of Houston. He specializes in ethics; his research interests are primarily in the history of ethics, with a particular focus on British moral philosophers. He is the author of three books, all published by OUP: Sidgwick's The Methods of Ethics: A Guide (2022), Rossian Ethics: W.D. Ross and Contemporary Moral Theory (2019), and Sidgwickian Ethics (2011).