R. C. Sproul (1939-2017) was founder of Ligonier Ministries, an international Christian discipleship organization located near Orlando, Florida. He was also first minister of preaching and teaching at 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. Dr. Sproul contributed dozens of articles to national evangelical publications, spoke at conferences, churches, colleges, and seminaries around the world, and wrote more than 100 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. Keith Mathison is professor of systematic theology at Reformation Bible College in Florida. He is also an associate editor of Tabletalk magazine at Ligonier Ministries. He is author of several books including From Age to Age: The Unfolding of Biblical Eschatology; The Shape of Sola Scriptura; and Given For You: Reclaiming Calvin's Doctrine of the Lord's Supper.