Greg Gilbert (MDiv, The Southern Baptist Theological Seminary) is senior pastor at Third Avenue Baptist Church in Louisville, Kentucky. He is the author of What Is the Gospel?; James: A 12-Week Study; and Who Is Jesus?; and is the coauthor of What Is the Mission of the Church? Greg and his wife, Moriah, have three children.Alex Duke (MDiv, The Southern Baptist Theological Seminary) is the editorial manager for 9Marks and the director of youth ministry and ecclesiological training at Third Avenue Baptist Church in Louisville, Kentucky.