'Doris is exploring, and taking the lead in creating, a field of 'empirically informed ethics'. He has paid close, careful, imaginative attention to psychological studies that turn out to have relevance to questions of the determinants of moral behavior, and has extracted the implications of those studies for the theories that he has also mastered, philosophical accounts of moral character, reasoning, and the production of moral actions. This is a book that will provide impetus to the formerly flagging conversation between those concerned with what is and what ought to be in the domain of morality.' John M. Darley, Princeton University