John MacArthur is the pastor-teacher of Grace Community Church in Sun Valley, California, where he has served since 1969. He is known around the world for his verse-by-verse expository preaching and his pulpit ministry via his daily radio program, Grace to You. He has also written or edited nearly four hundred books and study guides. MacArthur is chancellor emeritus of the Master's Seminary and Master's University. He and his wife, Patricia, live in Southern California and have four grown children.

R. C. Sproul (1939-2017) was founder of Ligonier Ministries, an international Christian discipleship organization located near Orlando, Florida. He was also founding pastor of Saint Andrew's Chapel in Sanford, Florida, first president of Reformation Bible College, and executive editor of Tabletalk magazine. His radio program, Renewing Your Mind, is still broadcast daily on hundreds of radio stations around the world and can also be heard online. Sproul contributed dozens of articles to national evangelical publications, spoke at conferences, churches, colleges, and seminaries around the world, and wrote more than one hundred books, including The Holiness of God, Chosen by God, and Everyone's a Theologian. He also served as general editor of the Reformation Study Bible.

Alistair Begg serves as the senior pastor of Parkside Church near Cleveland, Ohio. He has been in pastoral ministry since 1975 and served eight years in Scotland at both Charlotte Chapel in Edinburgh and Hamilton Baptist Church. He has written several books and is heard daily on the radio program Truth For Life. He and his wife, Susan, have three grown children.

Mark Dever (PhD, Cambridge University) is the senior pastor of Capitol Hill Baptist Church in Washington, DC, and president of 9Marks (9Marks.org). Dever has authored over a dozen books and speaks at conferences nationwide.

Kevin DeYoung (PhD, University of Leicester) is the senior pastor at Christ Covenant Church in Matthews, North Carolina, and assistant professor of systematic theology at Reformed Theological Seminary, Charlotte. He serves as board chairman of the Gospel Coalition and blogs at DeYoung, Restless, and Reformed. He is the author of several books, including Just Do Something; Crazy Busy; and The Biggest Story. Kevin and his wife, Trisha, have nine children.

Sinclair B. Ferguson (PhD, University of Aberdeen) is Chancellor's Professor of Systematic Theology at Reformed Theological Seminary and the former senior minister of the First Presbyterian Church in Columbia, South Carolina. He is the author of several books, the most recent being By Grace Alone: How the Grace of God Amazes Me. Sinclair and his wife, Dorothy, have four grown children.

Michael J. Kruger (PhD, University of Edinburgh) is the president and Samuel C. Patterson Professor of New Testament and Early Christianity at Reformed Theological Seminary in Charlotte, North Carolina, and a leading scholar on the origins and development of the New Testament canon. He blogs regularly at [...].

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.

Carl R. Trueman (PhD, University of Aberdeen) is professor of biblical and religious studies at Grove City College. He is an esteemed church historian and previously served as the William E. Simon Fellow in Religion and Public Life at Princeton University. Trueman has authored or edited more than a dozen books, including The Creedal Imperative; Luther on the Christian Life; and Histories and Fallacies. Trueman is a member of The Orthodox Presbyterian Church.

Nathan Busenitz (PhD, The Master's Seminary) is assistant professor of theology at the Master's Seminary. He previously served on the pastoral staff of Grace Community Church in Sun Valley, California. He is the author of numerous books and a regular contributor to the blog Preacher & Preaching.

Ligon Duncan (PhD, University of Edinburgh) is chancellor, CEO, and John E. Richards Professor of Systematic and Historical Theology at Reformed Theological Seminary. He previously served as the senior minister of the historic First Presbyterian Church in Jackson, Mississippi, for seventeen years. He is a cofounder of Together for the Gospel, a senior fellow of the Council on Biblical Manhood and Womanhood, and was the president of the Alliance of Confessing Evangelicals from 2004-2012. Duncan has edited, written, or contributed to numerous books. He and his wife, Anne, have two children and live in Jackson, Mississippi.

John M. Frame (DD, Belhaven College) is J. D. Trimble Chair of Systematic Theology and Philosophy at Reformed Theological Seminary in Orlando, Florida. He has published many books, including The Doctrine of God and Systematic Theology.

Derek Thomas (PhD, University of Wales, Lampeter) is the Chancellor's Professor of Systematic and Practical Theology at Reformed Theological Seminary and senior minister at First Presbyterian Church (ARP) in Columbia, South Carolina. He is the author of many books, including Calvin's Teaching on Job, and serves as a teaching fellow with Ligonier Ministries.