Known for works such as Rome Sweet Home and The Lamb's Supper: The Mass as Heaven on Earth, this author and Roman Catholic religious scholar held a professorship at Ohio's Franciscan University of Steubenville.
After graduating from Pennsylvania's Grove City College with a degree in philosophy, theology, and economics, he earned his Master of Divinity degree from the Gordon-Conwell Theological Seminary. He later received a doctorate in systematic theology from Marquette University.
He and Benjamin Wiker co-wrote a 2013 work titled Politicizing the Bible: The Roots of Historical Criticism and the Secularization of Scripture 1300-1700.
He and his wife and fellow Catholic apologist, Kimberly Hahn, co-founded the Saint Paul Center for Biblical Theology.
Raised in the Presbyterian denomination, he converted to Catholicism during the years when Pope John Paul II headed the Roman Catholic Church.