His research focuses on empirically informed metaethics and philosophical moral psychology. He has written numerous papers on the psychological basis of moral judgment and its normative implications, and three books on the nature of moral reasoning (Moral Judgment as Educated Intuitions, MIT Press 2017), the epistemology of moral judgment (Debunking Arguments in Ethics, Cambridge University Press 2018) and the significance of critical thinking for moral cognition (Moral Thinking, Fast and Slow, Routledge 2018). He is currently working on the psychology, political philosophy and metaethics of moral progress.