Owen Flanagan 
Varieties of Moral Personality [PDF ebook] 
Ethics and Psychological Realism

Owen Flanagan argues in this book for a more psychologically realistic ethical reflection and spells out the ways in which psychology can enrich moral philosophy. Beginning with a discussion of such "moral saints" as Gandhi, Mother Teresa, and Oskar Schindler, Flanagan charts a middle course between an ethics that is too realistic and socially parochial and one that is too idealistic, giving no weight to our natures.