Gregg Allison (PhD) is Professor of Christian Theology at The Southern Baptist Theological Seminary in Louisville, Kentucky where he teaches systematic theology. Previously he served on Cru staff at the University of Notre Dame and overseas in Italy and the Italian-speaking region of Switzerland. He is a pastor of Sojourn Community Church, and is the theological strategist for Sojourn Network, a church planting network of about thirty churches. He is the author of Historical Theology: An Introduction to Christian Doctrine; Sojourners and Strangers: The Doctrine of the Church; and Roman Catholic Theology and Practice: An Evangelical Assessment. Brad House is the Executive Pastor of Ministry at Sojourn Community Church, a large multisite church with four locations in Louisville, Kentucky, and Southern Indiana. Brad oversees the multisite campuses and their pastors and is Chairman of the Board for Sojourn Network, a church planting network of over thirty churches. He is the author of Community: Taking Your Small Group Off Life Support.