Fr. Gahl, a priest of the Prelature of Opus Dei, was ordained to the diaconate by Bishop Alvaro del Portillo and to the priesthood by Pope John Paul II in the Basilica of St. Peter. A professor at the Pontifical University of the Holy Cross since 1991, he has published on natural law theory, sexual ethics, moral action, and the narrative structure of the moral life. Interviews and comments by Father Gahl have appeared in The New York Times, The Washington Post, and The National Catholic Reporter as well as Fox News, CNN, CBS, BBC World, EWTN, and Vatican Radio.