C. J. Mahaney is the senior pastor of Sovereign Grace Church of Louisville. He has written, edited and contributed to numerous books, including Proclaiming a Cross-Centered Theology; Don't Waste Your Sports; and Sex, Romance, and the Glory of God. C. J. and his wife, Carolyn, are the parents of three married daughters and one son, and the happy grandparents to twelve grandchildren. John Piper is founder and lead teacher of desiringGod.org and chancellor of Bethlehem College & Seminary. He served for thirty-three years as a pastor at Bethlehem Baptist Church in Minneapolis, Minnesota, and is the author of more than fifty books, including Desiring God; Don’t Waste Your Life; and Providence. Craig Cabaniss (MDiv, Fuller Seminary) serves as lead pastor of Grace Church in Frisco, Texas. He and his wife, Ginger, have four children and two grandchildren. Dave Harvey (DMin, Westminster Theological Seminary) is the president of Great Commission Collective, a church-planting ministry. Dave pastored for thirty-three years, founded AmICalled.com, and travels widely across networks and denominations as a popular conference speaker. He is the author of When Sinners Say “I Do”; I Still Do!; Am I Called?; and Rescuing Ambition; and coauthor of Letting Go. Dave and his wife, Kimm, live in southwest Florida. He also writes at RevDaveHarvey.com, and you can follow him on Twitter. Bob Kauflin is a pastor, songwriter, worship leader, and author with over thirty-five years experience. After pastoring for twelve years, he became director of Sovereign Grace Music in 1997. He teaches on congregational worship through WorshipGod conferences, seminars, and his blog, worshipmatters.com. He is currently an elder at Sovereign Grace Church in Louisville, Kentucky. He and his wife, Julie, have six children and an ever-growing number of grandchildren. Jeff T. Purswell (MDiv, Trinity Evangelical Divinity School) is the director of theology and training for Sovereign Grace Churches and serves as the dean of the Sovereign Grace Pastors College. He is the editor of Bible Doctrine, an abridgement of Wayne Grudem’s Systematic Theology, and serves on the board of the Council on Biblical Manhood and Womanhood.