Renowned Luther scholar Volker Leppin comes on the podcast to for a great discussion on his most recent book Sola: Christ, Grace, Faith, and Scripture Alone in Martin Luther's Theology from Lutheran Quarterly Books and the famous debate between Martin Luther and Johann Eck in June and July of 1519 known as the Leipzig Debate which proved to be a turning point in Luther's understanding of Scripture's authority. 

Volker Leppin is the Horace Tracy Pitkin Professor of Historical Theology at Yale Divinity School. Prior to Yale, he taught church history at University of Jena and University of Tübingen. He is the author of many books, monographs, and articles in church history, especially on the Middle Ages, the Reformation, and Martin Luther. He is especially known for his biography of Luther titled Martin Luther: A Late Medieval Life.

The works about Luther that Dr. Leppin mentions were significant for him were:

Karl Holl's "Luther", presented as a lecture on Oct 31st 1917.

Gerhard Ebeling's book Evangelische Evangelienauslegung: Eine Untersuchung zu Luthers Hermeneutik

Heiko Oberman's book Luther: Man Between God and the Devil 

(Andrew also brought up Oberman's book The Dawn of the Reformation: Essays in Late Medieval and Early Reformation Thought)