Dr. John MacArthur is pastor-teacher of Grace Community Church in Sun Valley, Calif., as well as an author, conference speaker, president of The Master’s College and Seminary, and featured teacher with the Grace to You media ministry, which reaches major population centers across the United States, Canada, Europe, the Philippines, South Africa, and beyond. In addition to hosting the daily radio program, Dr. MacArthur is a prolific author, defending the faith in books including A Tale of Two Sons, The Gospel According to Jesus, and God's High Calling for Women.

Dr. Michael Horton is J. Gresham Machen Professor of Systematic Theology and Apologetics at Westminster Seminary California, and he co-hosts White Horse Inn, a nationally syndicated radio talk-show that explores issues revolving around Reformation theology in American Christianity. Dr. Horton is a minister in the United Reformed Churches of North America and is an accomplished writer whose many books include Christless Christianity and Introducing Covenant Theology.

Dr. R.C. Sproul is recognized throughout the church for his articulate and winsome proclamation of the holiness of God and other essential doctrines of the Christian faith. As the founder and president of Ligonier Ministries, his teaching can be heard worldwide on the program Renewing Your Mind, which is available on 230 radio outlets in the United States and in fifty countries worldwide. Dr. Sproul also serves as the senior minister of preaching and teaching at Saint Andrew’s in Sanford, Fla., and has authored over sixty books including The Holiness of God, The Truth of the Cross, Truths We Confess, and The Lightlings.

Dr. R.C. Sproul Jr. is the founder of the Highlands Study Center in Mendota, Va., which seeks to help Christians live more simple, separate, and deliberate lives to the glory of God and for the building of His kingdom. Dr. Sproul travels extensively as a conference speaker and has written several books including Tearing Down Strongholds, When You Rise Up, Bound for Glory, Biblical Economics, and Believing God.

Dr. Derek W.H. Thomas is the John Richards Professor of Practical and Systematic Theology at Reformed Theological Seminary in Jackson, Miss. He is also the minister of teaching at First Presbyterian Church in Jackson and editorial director for The Alliance of Confessing Evangelicals. Among Dr. Thomas’ many books are Praying the Saviour's Way, Mining for Wisdom, and Calvin’s Teaching on Job.

Dr. Steven J. Lawson is the senior pastor of Christ Fellowship Baptist Church in Mobile, Ala., and serves on the ministerial board for Reformed Theological Seminary and the board of directors for the Master’s College and Seminary. Dr. Lawson has also authored many books including Famine in the Land, Foundations of Grace, and The Expository Genius of John Calvin.

Dr. Alistair Begg is the senior pastor of Parkside Church in Cleveland, Ohio, and can be heard teaching daily on the radio program Truth for Life. Dr. Begg has served in pastoral ministry for over thirty years and has written many books including The Hand of God, Pathway to Freedom, and Made for His Pleasure.

Dr. R. Albert Mohler Jr. is president of The Southern Baptist Theological Seminary in Louisville, Kent., and one of evangelicalism’s leading cultural commentators. He hosts the daily radio show, The Albert Mohler Program, and serves on the board of Focus on the Family and the Council for Biblical Manhood and Womanhood. Dr. Mohler has also written or contributed to several books including Atheism Remix, Preaching the Cross, and He Is Not Silent. He can be followed on his blog, AlbertMohler Dot Com, and on Twitter @albertmohler.

Burk Parsons serves as associate minister at Saint Andrew’s in Sanford, Fla., and he is editor of Tabletalk. He holds the Master of Divinity degree from Reformed Theological Seminary, where he is also completing his Doctor of Ministry degree. He speaks regularly at various conferences and schools in the United States and abroad and has contributed to various books and journals. He is author of the forthcoming booklet Why Do We Have Creeds? (P&R, 2010), and he is editor of the books Assured by God and John Calvin: A Heart for Devotion, Doctrine & Doxology. Follow Burk Parsons on Twitter: @burk_parsons.

Tim Challies is author of the weblog 'Challies.com: Informing the Reforming' and lives near Toronto, Canada. He is also author of 'The Discipline of Spiritual Discernment'.

Ed Stetzer is president of LifeWay Research. He is also visiting professor at both Trinity Evangelical Divinity School and Southeastern Baptist Theological Seminary, as well as serves on the Church Services Team at the International Mission Board (SBC).