Klaus Issler is Professor of Christian Education and Theology in the Ph.D. in Educational Studies program, Talbot School of Theology, and adjunct faculty with the Institute for Spiritual Formation at Biola University, La Mirada, California. He holds a Th.M. from Dallas Theological Seminary, M.A. in Curriculum and Instruction from the University of California, Riverside, and a Ph.D. in Education from Michigan State University. Ronald T. Habermas is McGee Professor of Biblical Studies and Christian Formation at John Brown University in Siloam Springs, Arkansas. He received a Master of Divinity from the North American Baptist Seminary, a Master of Arts in Educational Ministries from Wheaton Graduate School, and a Ph.D. in Education from Michigan State University.