Father Donald Calloway, MIC, is the vicar provincial and vocation director for the Blessed Virgin Mary, Mother of Mercy Province of the Marian Fathers of the Immaculate Conception, as well as the author of a number of books. His books Champions of the Rosary: The History and Heroes of a Spiritual Weapon, No Turning Back: A Witness to Mercy, and Under the Mantle: Marian Thoughts from a 21st Century Priest are Catholic bestsellers.