Dr. Thomas joined the staff in 2011, coming from Jackson, MS, where he was Chairman of the Theology Department at Reformed Theological Seminary and Minister of Teaching at First Presbyterian Church. He is from Wales. He is a graduate of the University of Wales (Bc.S), Reformed Theological Seminary (M.Div), and University of Wales/Lampeter (Ph.D.). He was ordained in the Evangelical Church of Ireland, where he served Stranmillis Evangelical Presbyterian Church in Belfast for 17 years before going to Mississippi. He remains the Distinguished Visiting Professor of Systematic and Historical Theology at RTS and is Editorial Director, Alliance of Confessing Evangelicals. He is also a well published author.

He is married to Rosemary. They have two grown children and one granddaughter and one grandson.