The Work of the Holy Spirit

Rev. Dr. Ian Hamilton is an Associate Minister in the Free Church of Scotland, an adjunct professor at Greenville Presbyterian Theological Seminary and Westminster Seminary, UK and serves as a trustee for GPTS. For many years he served on the board for the Banner of Truth Trust, and as Editor of the Magazine. He served as the minister of Loudoun Church of Scotland from 1979-1999 and as the minister of Cambridge Presbyterian Church from 1999-2016. He and his wife Joan have four children and six grandchildren.

Rev. Dr. Jonathan. L. Master (PhD, University of Aberdeen) serves as President of Greenville Presbyterian Theological Seminary. Dr. Master served in pastoral ministry in several congregations in Maryland and Pennsylvania, and subsequently as Dean and Professor of Theology at Cairn University near Philadelphia, Pennsylvania. He has taught for numerous other institutions including Westminster Seminary (UK) and Edinburgh Theological Seminary. Dr. Master is the author and editor of books including A Question of Consensus: The Doctrine of Assurance After the Westminster Confession (Fortress Press, 2015), The God We Worship (P&R, 2016), On Reforming Worship (Covenant Publications, 2018), Growing in Grace (Banner of Truth, 2020), Reformed Theology (P&R, 2023), and You Must Be Born Again (P&R, 2024). He contributes regularly to a variety of periodicals, including Tabletalk Magazine. Dr. Master serves on the Executive Council of the Gospel Reformation Network, as well as on the Board of Directors of the Alliance of Confessing Evangelicals, where he hosts the “Theology on the Go” podcast for the Alliance with James Dolezal.

Rev. Dr. Ryan McGraw (PhD, University of the Free State) serves as Morton H. Smith Professor of Systematic Theology. He has pastored churches in the PCA and OPC, and serves currently as Teacher at Covenant Community OPC, Taylors SC. His academic books include works on John Owen (V&R 2014; Palgrave 2017), Reformed Scholasticism (T&T Clark 2020), and Charles Hodge (V&R 2023). Aiming at the church more broadly, his passion has been to popularize devotional Trinitarian theology in numerous books such as 31 Meditations on the Trinity (RHB 2023) and What is Covenant Theology? (Crossway 2024). Editing and contributing to several journals, he and Joel Beeke are co-editors of the Cultivating Biblical Godliness series.

Stephen was ordained and installed as Westminster’s pastor in 2019. He was born and raised in Pasadena, Maryland and earned his BA in history from the University of Maryland University College. Stephen then moved to Greenville, South Carolina where he earned his Masters of Divinity from Greenville Presbyterian Theological Seminary (GPTS). In addition to weekly preaching, teaching, and visitation, Stephen’s writing has been featured on Reformation 21, Place for Truth, Heidelblog, MereOrthodoxy, and in Tabletalk Magazine. Together with friends he hosts several podcasts on the Westminster Standards ( The Shorter and Larger for Life podcasts) and is a General Council member of the Gospel Reformation Network (GRN). Stephen is also the author of “Loving the Law” a book from Christian Focus Publications on the three uses of the Moral Law, released in 2025. Stephen and his wife, Sarah, are high school sweethearts and have been married since 2013. They are proud parents to four beautiful children and consider the saints of Westminster an extension of their family.

Rev. Mark G. Johnston spent ten years in church planting helping to oversee the establishment of Trinity EPC, Richhill in Northern Ireland. He has also pastored in England, the United States, and Wales, and he is currently minister of Groomsport EPC in Northern Ireland. He serves on the board of the Banner of Truth Trust and is author of several books, including This World Is Not My Home: Reflections for Pilgrims on the Way and commentaries in the Let’s Study series on John, Colossians and Philemon, and 2 Peter and Jude.

Rev. Vinícius Pimentel is a minister in the Igreja Presbiteriana do Brasil and pastor of Igreja Presbiteriana Emanuel (IPE). He earned the Master of Divinity (M.Div.) from Greenville Presbyterian Theological Seminary in the United States, where he received theological training in the Reformed tradition. Before entering pastoral ministry, he studied and worked in the field of law, holding both a Bachelor of Laws and a Master’s degree in Law from the Universidade Federal de Pernambuco.