Father Donald Calloway, MIC, a convert to Catholicism, is a member of the Congregation of the Marian Fathers of the Immaculate Conception. Before his conversion to Catholicism, he was a high school dropout who had been kicked out of a foreign country, institutionalized twice, and thrown in jail multiple times. After his radical conversion, he earned a B.A. in Philosophy and Theology from the Franciscan University of Steubenville, Ohio; M.Div. and S.T.

B. degrees from the Dominican House of Studies in Washington, D.C.; and an S.T.L. in Mariology from the International Marian Research Institute in Dayton, Ohio. In addition to Under the Mantle: Marian Thoughts from a 21st Century Priest (Marian Press, 2013), he has written No Turning Back: A Witness to Mercy (Marian Press, 2010), a bestseller that recounts his conversion story.

He also is the author of Purest of All Lilies: The Virgin Mary in the Spirituality of St. Faustina (Marian Press, 2008). He introduced and arranged Marian Gems: Daily Wisdom on Our Lady (Marian Press, 2014). He is the author of the international bestseller Consecration to St. Joseph (Marian Press, 2019); co-author of Consecration to St. Joseph for Children and Families (Marian Press, 2022); and author of the acclaimed graphic novel The Chaste Heart of St. Joseph (Marian Press, 2023). Further, he has written academic articles and is the editor of The Immaculate Conception in the Life of the Church (Marian Press, 2004) and The Virgin Mary and Theology of the Body (Marian Press, 2005).

Father Calloway is the Vicar Provincial and Vocation Director for the Mother of Mercy Province.