William Duncan is the director of the Marriage Law Foundation, a legal organization whose mission is providing legal resources in defense of marriage as the union of a husband and wife. He previously served as acting director of the Marriage Law Project at the Catholic University of America’s Columbus School of Law and a visiting professor at

Brigham Young University’s J. Reuben Clark Law School where he was executive director of the Marriage and Family Law Research Grant. He teaches family law to undergraduates at BYU as an adjunct professor.