Stephen Um (Ph.D., University of St. Andrews) is the senior minister of Citylife Presbyterian Church in Boston, MA. He teaches New Testament studies at Gordon-Conwell Theological Seminary, serves as a Council member with The Gospel Coalition, and is Associate Training Director f0r Redeemer City to City. For the past 23 years, Stephen and his wife, have been involved in several Presbyterian Churches throughout the Northeastern part of the country. He is the author of The Kingdom of God (TGC Booklet) and Why Cities Matter (Crossway). His sermons and resources are available online at The Center for Gospel Culture.