Ezra Sullivan, O.P., a native of California, is a Dominican friar of the Province of St. Joseph in the United States. Having served in a parish after ordination to the priesthood, he earned his doctorate in theology and is now professor of moral theology and psychology at the University of St. Thomas Aquinas in Rome (Angelicum). He is the author of numerous books and articles, including Heroic Habits: Discovering the Soul’s Potential for Greatness and Habits and Holiness: Ethics, Theology, and Biopsychology.