The Moral Universe, co-authored with John Bengson and Terence Cuneo (Oxford University Press 2024)
Philosophical Methodology, co-authored with John Bengson and Terence Cuneo (Oxford University Press 2022)
Living Ethics 3rd ed. (2024)
The Fundamentals of Ethics 6th ed. (Oxford University Press 2023)
The Ethical Life: Fundamental Readings in Ethics and Moral Problems 6th ed. (Oxford University Press 2023)
A Concise Introduction to Ethics (Oxford University Press 2019)
Reason & Responsibility 16th ed. (Cengage 2016: earlier a joint effort with the late Joel Feinberg, who created this book and ushered it through eight editions before bringing me on as co-editor in 1997.)
Ethical Theory: An Anthology 2nd ed. (Blackwell 2012)
Metaethics: Critical Concepts in Philosophy (4 vols. Routledge 2008)
Foundations of Ethics: An Anthology (Blackwell 2006: co-edited with Terence Cuneo)
Whatever Happened to Good and Evil? (Oxford University Press 2004)
Moral Realism: A Defence (Oxford University Press 2003)