Timothy Keller is the founder and senior pastor of Redeemer Presbyterian Church in New York City, and the New York Times bestselling author of The Reason for God and The Prodigal God. He has also mentored young urban church planters and pastors in New York and other cities through Redeemer City to City, which has helped launch over 200 churches in 35 global cities to date. Daniel Montgomery is founding pastor of Sojourn Community Church, a multi-site congregation with three campuses in Louisville, Kentucky and one in New Albany, Indiana. Sojourn began in 2000 with about sixty people and has grown into a community of nearly four thousand. Daniel now serves Sojourn as pastor of teaching, leadership, and church planting. He has served on a leadership task force for the Southern Baptist Convention and on the board of directors for the Acts 29 church planting network. In 2011, Daniel cofounded the Sojourn Network to multiply churches in North America and beyond. He is the coauthor of Faith-Mapping (Crossway, 2013). Mike Cosper is the executive director of Harbor Media, a non-profit media company serving Christians in a post-Christian world. He served for sixteen years as a pastor at Sojourn Community Church in Louisville, Kentucky, and is the author of Recapturing the Wonder, The Stories We Tell, and Rhythms of Grace. He lives with his family in Louisville, Kentucky. Alan Hirsch is an award-winning author on various aspects of missional Christianity and co-founder of Future Travelers, an intentional learning journey for contemporary churches seeking to transition to becoming authentic movements