Paul F. M. Zahl (DTheol, University of Tuebingen) is a retired Episcopal minister and dean/president emeritus of Trinity Episcopal School for Ministry. He is the author of Grace in Practice.

L. Michael Morales (PhD, University of Bristol) is professor of biblical studies at Greenville Presbyterian Theological Seminary and the author of several books, including Who Shall Ascend the Mountain of the Lord?

V. Philips Long (PhD, Cambridge University) is professor of Old Testament at Regent College. He is the author of many books and commentaries and an ordained teaching elder in the PCA.

Frank Thielman (PhD, Duke University) is Presbyterian Chair of Divinity and professor of New Testament at Beeson Divinity School. He is also an ordained Presbyterian (PCA) minister and the author of many books and commentaries.

Ian K. Smith is the principal of Christ College, Sydney, where he also teaches Greek and New Testament. He has also served in parish ministry and as a missionary in the Pacific island nation of Vanuatu. He speaks regularly at churches, conferences, and other venues.

Willem A. VanGemeren is director of the Doctor of Philosophy in Theological Studies program and professor of Old Testament and Semitic languages at Trinity Evangelical Divinity School in Deerfield, Illinois.

Sean Michael Lucas (PhD, Westminster Theological Seminary) is the senior minister at the First Presbyterian Church in Hattiesburg, Mississippi, and associate professor of church history at Reformed Theological Seminary in Jackson, Mississippi. He previously taught at Covenant Theological Seminary for five years, serving as the chief academic officer.

Jay Sklar (PhD, University of Gloucestershire) is professor of Old Testament and vice president of academics at Covenant Theological Seminary.

Michael Horton (PhD, University of Coventry and Wycliffe Hall, Oxford) is the J. Gresham Machen Professor of Systematic Theology and Apologetics at Westminster Seminary in California. In addition to being the author of many popular and academic books, he is also the editor in chief of Modern Reformation magazine, a host of the White Horse Inn radio broadcast, and a minister in the United Reformed Churches.

Miles V. Van Pelt (PhD, The Southern Baptist Theological Seminary) is the Alan Belcher Professor of Old Testament and Biblical Languages, academic dean, and director of the Summer Institute for Biblical Languages at Reformed Theological Seminary, Jackson. He also serves on the pastoral staff of Grace Reformed Church in Madison, Mississippi. He and his wife, Laurie, have four children.

Kathleen Nielson (PhD, Vanderbilt University) is an author and speaker who loves working with women in studying the Scriptures. After directing the Gospel Coalition’s women’s initiatives from 2010–2017, she now serves as senior adviser and book editor for TGC. She and her husband, Niel, make their home partly in Wheaton, Illinois, and partly in Jakarta, Indonesia. They have three sons, two daughters-in-law, and five granddaughters.

Elyse Fitzpatrick (MA, Trinity Theological Seminary) is a counselor, a retreat and conference speaker, and the author of over twenty books, including Because He Loves Me; Comforts from the Cross; and Found in Him.

Bruce A. Ware (PhD, Fuller Theological Seminary) is T. Rupert and Lucille Coleman Professor of Christian Theology at the Southern Baptist Theological Seminary. He has written numerous journal articles, book chapters, and book reviews, and is the author of God's Lesser Glory and God's Greater Glory.

Ray Ortlund is the president of Renewal Ministries, the pastor to pastors at Immanuel Nashville Church, and a canon theologian with the Anglican Church in North America. He is the author of several books, including Marriage and the Mystery of the Gospel; The Death of Porn; and the Preaching the Word commentaries on Isaiah and Proverbs. He is also a contributor to the ESV Study Bible. Ray and his wife, Jani, have been married for fifty years.

Kelly M. Kapic (PhD, King's College, University of London) is a professor of theological studies at Covenant College in Lookout Mountain, Georgia, where he has taught since 2001. Kapic is an author or editor of more than fifteen books. In addition to his work on the Puritan John Owen, his other writings include You’re Only Human and Embodied Hope, which each won a Christianity Today Book of the Year Award.

Graeme Goldsworthy (PhD, Union Theological Seminary) previously served as a lecturer in biblical theology, Old Testament, and hermeneutics at Moore Theological College in Sydney, Australia. Graeme lives in Brisbane, Australia, with his wife, Miriam. They have four adult children.

Greg Gilbert (MDiv, The Southern Baptist Theological Seminary) is senior pastor at Third Avenue Baptist Church in Louisville, Kentucky. He is the author of What Is the Gospel?; James: A 12-Week Study; and Who Is Jesus?; and is the coauthor of What Is the Mission of the Church? Greg and his wife, Moriah, have three children.

Bryan Chapell is a bestselling author of many books, including Christ-Centered Preaching and Holiness by Grace. He is pastor emeritus of the historic Grace Presbyterian Church in Peoria, Illinois; president emeritus of Covenant Theological Seminary; and president of Unlimited Grace Media (unlimitedgrace.com), which broadcasts daily messages of gospel hope in many nations.  

James M. Hamilton Jr. (PhD, The Southern Baptist Theological Seminary) is professor of biblical theology at the Southern Baptist Theological Seminary and preaching pastor at Kenwood Baptist Church.

Timothy Z. Witmer (DMin, Reformed Theological Seminary) is professor of practical theology and coordinator of the practical theology department at Westminster Theological Seminary. He has served as senior minister of Crossroads Community Church since 1986 and is the author of The Shepherd Leader: Achieving Effective Shepherding in Your Church.

David R. Helm (MDiv, Gordon-Conwell Theological Seminary) serves as senior pastor of Christ Church Chicago. He also serves as chairman of the board of directors for the Charles Simeon Trust, an organization that promotes practical instruction in preaching. He is the coauthor (with Jon Dennis) of The Genesis Factor; a contributor to Preach the Word: Essays on Expository Preaching; and the author of The Big Picture Story Bible and 1—2 Peter and Jude in the Preaching the Word commentary series.

Michael J. Glodo (ThM, Westminster Theological Seminary) is associate professor of pastoral theology and former dean of the chapel at Reformed Theological Seminary, Orlando. He is a contributor to A Biblical-Theological Introduction to the Old Testament and the ESV Gospel Transformation Study Bible, as well as numerous articles, including many at Reformed Faith & Practice. You can find him at mikeglodo.com.

COLIN S. SMITH is the senior pastor of The Orchard Evangelical Free Church in Arlington Heights, IL, where he has been since 1996. He is the author of The 10 Greatest Struggles of Your Life and can be heard on his Unlocking the Bible broadcast with Moody radio.

Nancy Guthrie teaches the Bible at her home church, Cornerstone Presbyterian Church in Franklin, Tennessee, as well as at conferences around the country and internationally, including her Biblical Theology Workshop for Women. She is the author of numerous books and the host of the Help Me Teach the Bible podcast with the Gospel Coalition. She and her husband founded Respite Retreats for couples who have faced the death of a child, and they are cohosts of the GriefShare video series. 

Julius J. Kim (PhD, Trinity Evangelical Divinity School) serves as an elder at New Life Presbyterian Church and the visiting professor of practical theology at Westminster Seminary California. He is the author of Preaching the Whole Counsel of God and a contributor to the ESV Gospel Transformation Study Bible.

Dane C. Ortlund (PhD, Wheaton College) serves as senior pastor of Naperville Presbyterian Church in Naperville, Illinois. He is the author of Gentle and Lowly: The Heart of Christ for Sinners and Sufferers and Deeper: Real Change for Real Sinners. Dane and his wife, Stacey, have five children.

Iain M. Duguid (PhD, University of Cambridge) is professor of Old Testament at Westminster Theological Seminary. He also serves as pastor of Christ Presbyterian Church in Glenside, Pennsylvania.

Jonathan Pennington (PhD, University of St Andrews) serves as professor of New Testament interpretation at the Southern Baptist Theological Seminary and pastor of spiritual formation at Sojourn East church in Louisville, Kentucky. He is the author of several books including Reading the Gospels Wisely, The Sermon on the Mount and Human Flourishing, and Jesus the Great Philosopher.

Justin S. Holcomb (PhD, Emory University) is an Episcopal priest and teaches theology at Reformed Theological Seminary, Orlando. He has written or edited more than twenty books on abuse, theology, and biblical studies. Justin and his wife, Lindsey, live in Orlando, Florida, with their two daughters.

Bob Yarbrough (PhD, University of Aberdeen, Scotland) is professor of New Testament at Covenant Theological Seminary in St. Louis, Missouri. He was previously professor of New Testament and department chair at Trinity Evangelical Divinity School. He is the author or coauthor of several books and is active in pastoral training in Africa.

C. D. "Jimmy" Agan III (PhD, Aberdeen University) is professor of New Testament and director of homiletics at Covenant Theological Seminary in St. Louis, Missouri. He is the author of The Imitation of Christ in the Gospel of Luke: Growing in Christlike Love for God and Neighbor.

Stephen Um (PhD, University of St. Andrews) is the author of Micah for You and 1 Corinthians in the Preaching the Word series. Stephen and his wife, Kathleen, live in Boston, Massachusetts, with their three daughters.

Kevin DeYoung (PhD, University of Leicester) is the senior pastor at Christ Covenant Church in Matthews, North Carolina, and associate professor of systematic theology at Reformed Theological Seminary, Charlotte. He has written books for children, adults, and academics, including Just Do Something; Impossible Christianity; and The Biggest Story Bible Storybook. Kevin’s work can be found on clearlyreformed.org. Kevin and his wife, Trisha, have nine children.

Jon M. Dennis (MDiv, Trinity Evangelical Divinity School; MLA, University of Chicago) is the founding pastor and senior pastor of Holy Trinity Church in Chicago, Illinois. He has helped to establish the church's four congregations and various ministries including Hope for Chicago, the Charles Simeon Trust, and the Chicago Partnership for Church Planting. He is the author of several books and is currently working to complete his doctorate of ministry at Westminster Theological Seminary. Jon and his wife, Amy, have five children.

R. Kent Hughes (DMin, Trinity Evangelical Divinity School) is senior pastor emeritus of College Church in Wheaton, Illinois, and former professor of practical theology at Westminster Theological Seminary in Philadelphia, Pennsylvania. Hughes is also a founder of the Charles Simeon Trust, which conducts expository preaching conferences throughout North America and worldwide. He serves as the series editor for the Preaching the Word commentary series and is the author or coauthor of many books. He and his wife, Barbara, live in Spokane, Washington, and have four children and an ever-increasing number of grandchildren.

J. D. Greear is the pastor of the Summit Church in Raleigh-Durham, North Carolina, and the president of the Southern Baptist Convention. He is the author of several books, including Gaining by Losing and Stop Asking Jesus into Your Heart.

Robert A. Peterson (PhD, Drew University) is a writer and theologian. He taught for many years at various theological seminaries and has written or edited over thirty books.

Jared C. Wilson is assistant professor of pastoral ministry at Midwestern Baptist Theological Seminary and director of the Pastoral Training Center at Liberty Baptist Church in Kansas City, Missouri. He is a popular author and conference speaker, and also blogs regularly at Gospel Driven Church, hosted by the Gospel Coalition. His books include Gospel Wakefulness; The Storytelling God; and The Wonder-Working God.

Mike Bullmore (PhD, Northwestern University) serves as the senior pastor of Crossway Community Church in Bristol, Wisconsin. He was formerly professor of homiletics/practical theology and department chair at Trinity Evangelical Divinity School in Deerfield, Illinois. Mike lives in Kenosha, Wisconsin, with his wife, Beverly. They have three children.

Vern S. Poythress (PhD, Harvard University; ThD, University of Stellenbosch) is Distinguished Professor of New Testament, Biblical Interpretation, and Systematic Theology at Westminster Theological Seminary in Philadelphia, Pennsylvania, where he has taught for four decades. In addition to earning six academic degrees, he is the author of numerous books and articles on biblical interpretation, language, and science.