Johann Michael Reu (1869–1943), was a GermanLutheran theologian. Born in Diebach, Germany, Reu attended mission institute founded by Wilhelm Loehe in Neuendettelsau. He was ordained a pastor at age 20, and emigrated to the United States in 1889. In 1899, he joined the faculty of Wartburg Theological Seminary in Dubuque, IA, where he taught until his death in 1943. Reu was a prolific author of 66 books, covering nearly all topics in Christian life, as well as more than 3000 published book reviews.