Stephen J. Nichols (PhD, Westminster Theological Seminary) serves as the president of Reformation Bible College and chief academic officer of Ligonier Ministries. He has written over twenty books and is an editor of the Theologians on the Christian Life series. He also hosts the weekly podcast 5 Minutes in Church History.

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.

Richard B. Gaffin Jr. (ThD, Westminster Theological Seminary) is emeritus professor of biblical and systematic theology at Westminster Theological Seminary in Philadelphia, where he taught for over forty years until his retirement in 2010. He is an ordained minister in the Orthodox Presbyterian Church.

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.

Christopher W. Morgan (PhD, Mid-America Baptist Theological Seminary) is a professor of theology and the dean of the School of Christian Ministries at California Baptist University. He is also the lead pastor of Immanuel Baptist Church in Highland, CA. He is the author or editor of over twenty books, including several volumes in the Theology in Community series.

Andreas J. Köstenberger (PhD, Trinity Evangelical Divinity School) is the theologian in residence at Fellowship Raleigh, a cofounder of Biblical Foundations, a host at Oak Tree Cottage, and the author, editor, or translator of over sixty books. He and his wife, Marny, have four grown children and live in North Carolina.