David R. Helm (MDiv, Gordon-Conwell Theological Seminary) serves as senior pastor of Christ Church Chicago. He also serves as chairman of the board of directors for the Charles Simeon Trust, an organization that promotes practical instruction in preaching. He is the coauthor (with Jon Dennis) of The Genesis Factor; a contributor to Preach the Word: Essays on Expository Preaching; and the author of The Big Picture Story Bible and 1–2 Peter and Jude in the Preaching the Word commentary series. Jon M. Dennis (MDiv, Trinity Evangelical Divinity School; MLA, University of Chicago) is the founding pastor and senior pastor of Holy Trinity Church in Chicago, Illinois. He has helped to establish the church's four congregations and various ministries including Hope for Chicago, the Charles Simeon Trust, and the Chicago Partnership for Church Planting. He is the author of several books and is currently working to complete his doctorate of ministry at Westminster Theological Seminary. Jon and his wife, Amy, have five children.