Derek W.H. Thomas, a native of Wales, is the Senior Minister at First Presbyterian Church (ARP) in Columbia, South Carolina. He is also the Robert Strong Professor of Systematic and Pastoral Theology at Reformed Theological Seminary (Atlanta). He previously served as the Chairman of the Theology Department at Reformed Theological Seminary (Jackson) and the Minister of Teaching at First Presbyterian Church (PCA) in Jackson, Mississippi. He is also a Teaching Fellow with Ligonier Ministries and Dean of the DMin. Program. He holds a Bachelor of Science in Mathematics from the University of Wales, a Masters of Divinity from Reformed Theological Seminary (Jackson), and a Doctor of Philosophy from the University of Wales (Lampeter). He was ordained in the Evangelical Church of Ireland, and served Stranmillis Evangelical Presbyterian Church in Belfast for 17 years before moving to the United States. He has published more than twenty five books and contributed to many others.

He and his wife, Rosemary, have two grown children and two grandchildren, two dogs named Luther and Gracie Spangles, and a somewhat dysfunctional cat named Chloe. He is passionate about classical music and opera.