He has served on the Pontifical Council for Justice and Peace (1990-95), the International Theological Commission (1986-95) and the Pontifical Academy for Life (since 2001). With Germain Grisez and Joseph Boyle he is credited with the revival of natural law ethics in the secular academy. His published works include “Natural Law and Natural Rights” (1980), “Fundamentals of Ethics” (1983), “Moral Absolutes: Tradition, Revision and Truth” (1991) and “Aquinas: Moral, Political, and Legal Theory” (1998).
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