From the Youtube post:
Scott gave his life to Christ in high school. He soon became a convinced Calvinist. In seminary some thought he out-calvined Calvin. While teaching a Bible class, as a minister, a student asked him, “Where in the Bible does the Bible teach that it is the sole rule of faith?” Unable to give a solid answer he began an in-depth study, which would lead him Home to the Catholic Church. Dr. Hahn is Professor of Theology and Scripture at the Franciscan University of Steubenville as well as the President of the St. Paul Center for Biblical Theology. His books include such titles as “Rome Sweet Home”, “A Father Who Keeps His Promises”, and “The Lamb’s Supper: The Mass as Heaven on Earth”.