Fr. William J. Slattery, PhD, STL, was ordained priest in St. Peter’s Basilica by Pope John Paul II on January 3, 1991.

He was awarded the Ph.D in philosophy, with a specialization in epistemology (the theory of cognition) at the Pontifical Gregorian University and also received the title of S.T.L. in theology at the Pontifical Lateran University.

He speaks French, Spanish, English, and Italian and has also studied Latin, Greek, Gaelic, and German.

He was born amid the hills of southern Ireland in County Waterford close to the Atlantic Ocean. He studied in Abbeyside at the Augustinian Friars’ high school, and later in Dublin, Salamanca, and Rome.

He has worked in the U.S.A. and Canada directing the Spiritual Exercises of St. Ignatius retreats.

While residing at the Pontifical North American College in Rome during his Ph.D and S.T.L. studies, he prepared a series of books on history and on the formation of priests.

His published works so far are Heroism and Genius: How Catholic Priests Helped Build ‒ and can Help Rebuild ‒ Western Civilization (Ignatius Press, 2017) and The Logic of Truth: St. Thomas Aquinas’s Epistemology and Antonio Livi’s Alethic Logic (Leonardo da Vinci, 2016).