Stephen Um (Ph.D., University of St. Andrews) is the senior minister of Citylife Presbyterian Church in Boston, MA. He serves as a Council member with The Gospel Coalition, and is Associate Training Director for Redeemer City to City. For the past 25 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, Why Cities Matter (Crossway, 2013), the commentary on 1 Corinthians from the Preaching the Word series (2015), and the forthcoming commentary Micah for You (Good Book Company). His sermons and resources are available online at The Center for Gospel Culture.