Andrew is Professor of Biblical Studies at Moody Bible Institute and has been teaching full-time since 1998. Prior to teaching at Moody, Andrew served as a pastor of a 2nd generation Korean Church. His teaching focuses on Old Testament Bible (Genesis, Pentateuch, Minor Prophets, Psalms), Biblical Theology (1 Samuel, OT Theology, Theology of Suffering, Theology of Sexuality), and Hebrew Language (grammar, exegesis, and Hebrew reading courses). He has taught more than 30 different courses. In addition, he has served as faculty sponsor for student groups, including the Student Theological Society and the MK Fellowship. Andrew regularly speaks in Chicago-land churches. He has also served as an adjunct teacher at Wheaton College and Northern Theological Seminary.