WILLIAM D. THRASHER (B.S., Auburn University; Th.M., Th.D., Dallas Theological Seminary) has served on the faculty of Moody Bible Institute since 1980 and on the graduate school faculty since 1990, where he oversees the Master's Program in Spiritual Formation and Discipleship. He is a frequent speaker in churches and retreats across the county. He has written numerous articles on a variety of subjects related to Christian living. His books include, Living the Life God has Planned, A Journey to Victorious Praying, Believing God for His Best, and Putting God Back into the Holidays published by Moody Publishers and he has also written How to be a Soul Physician, The Attributes of God in Pauline Theology, and Principles of Christian Living from Romans 5-8. He has written "Jonah" in the Moody Bible Commentary and has authored two online courses: Biblical Spiritual Formation and Biblical Spiritual Formation Lab 1. He is married to Penny and they have three sons- Will, Michael, and David.