John Piper has had a profound impact on countless men and women over his nearly thirty years of ministry. From his online ministry with Desiring God to his preaching ministry at Bethlehem Baptist to his writing ministry in over thirty books, his faithful service has encouraged and challenged many with God's Word. Piper's influence does not stem from his own abilities and accomplishments, but finds its source in his consistent and humble leading of others to Scripture, where the breathtaking glory of God is displayed in all its wonder. We rejoice and are changed as we encounter glorious truths about God in Piper's ministry. It is in this spirit that friends and colleagues of Piper, including Wayne Grudem, D. A. Carson, Randy Alcorn, and others, honor him by presenting essays covering topics central to his ministry: prayer, the sovereignty of God, justification, Jonathan Edwards, Christian Hedonism, and more. Pastors, scholars, and lay leaders will benefit from this tribute to a man who has labored so faithfully for the fame of God's name.