Stephen Um (PhD, University of St. Andrews) is the Senior Minister of Citylife Church in Boston, Massachusetts. He also teaches New Testament at Gordon-Conwell Theological Seminary and serves as Associate Training Director with Redeemer City to City. For the past 18 years, Stephen and his wife, Kathleen, have been involved in several Presbyterian churches throughout the Northeastern part of the country. He is the author of Why Cities Matter (Crossway). Stephen also serves as a Council member with The Gospel Coalition. --This text refers to the paperback edition.