Wayne Grudem holds a B.A. from Harvard University, an M.Div. from Westminster Theological Seminary, and a Ph.D. from the University of Cambridge. He taught at Trinity Evangelical Divinity School for 20 years before becoming Research Professor of Theology and Biblical Studies at Phoenix Seminary in 2001. Dr. Grudem served on the committee overseeing the ESV translation of the Bible, and he served as General Editor for the ESV Study Bible.
Iain Duguid, a native of Great Britain, is Professor of Old Testament at Grove City College. He previously taught at Westminster Seminary in California and Reformed Theological Seminary in Jackson, Mississippi. He has planted churches in Oxford, England, and Fallbrook, California, and most recently Christ Presbyterian Church in Grove City, Pennsylvania.
David Powlison is a faculty member at the Christian Counseling & Educational Foundation. He holds a Ph.D. from the University of Pennsylvania, as well as an M.Div. from Westminster Theological Seminary. David has been counseling for over thirty years and has written numerous articles on biblical counseling and on the relationship between faith and psychology.
Jeff Purswell is the Dean of the Pastors College of Sovereign Grace Ministries. He is a summa cum laude graduate of Trinity Evangelical Divinity School in Deerfield, Illinois, where he taught Greek as a teaching fellow in the New Testament department and worked as a teaching assistant in systematic theology for Wayne Grudem. He is the editor of Bible Doctrine, an abridgment of Wayne Grudem’s Systematic Theology.
Nathan Sasser has bachelor's degrees in English and in Philosophy from North Carolina State University, has an M.Div. from Westminster Theological Seminary, and is a PhD student in philosophy at the University of South Carolina. He also serves as Jeff Purswell’s academic assistant at the Pastors College.
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