Sinclair Buchanan Ferguson (born 21 February 1948) is a Scottish theologian known in Reformed Christian circles for his teaching, writing, and editorial work. He has been Chancellor's Professor of Systematic Theology at Reformed Theological Seminary since 2017, commuting from Scotland, where he is an assistant minister at St. Peter's Free Church of Scotland, Dundee. He is currently a preaching associate at Trinity Church, Aberdeen Career Ferguson studied at the University of Aberdeen for all of his university education, earning first a master of arts, then a bachelor of divinity, before gaining his Ph.D. During his days as a student, he worshiped at Gilcomston South Church, under the ministry of William Still. Ferguson was ordained as a minister in the Church of Scotland in 1971, becoming the minister of St. John's, Baltasound, the most northerly parish in Scotland, on the island of Unst, Shetland. He was the pastor there for 10 years. After his service on Unst, he was offered a teaching position as a part-time Professor of Systematic Theology at Westminster Theological Seminary, Philadelphia. He then moved back to his native Scotland in 1997, filling the pulpit at St George's-Tron Church, Glasgow, succeeding the 20-year ministry of Eric Alexander. In the mid-2000s, he then transferred back to the US to the Associate Reformed Presbyterian Church, serving as the senior pastor of historic First Presbyterian Church of Columbia, South Carolina. From 25 August 2013, he has served as a preacher and elder at St. Peter's Free Church, Dundee. In 2022, a Festschrift was published in his honor. Theology for Ministry: How Doctrine Affects Pastoral Life and Practice includes contributions from Joel Beeke, Ligon Duncan, W. Robert Godfrey, Michael Horton, Douglas Kelly, Robert Letham, Philip Ryken, and Chad Van Dixhoorn. Other Roles Ferguson has served as an editor with the Banner of Truth Trust. He was also a professor of systematic theology at Redeemer Seminary in Dallas. He has held the Charles Krahe Chair for Systematic Theology at Westminster Theological Seminary. He also previously served as a council member of the Alliance of Confessing Evangelicals. He serves as a Teaching Fellow for Ligonier Ministries. Works Ferguson speaks at numerous conferences worldwide. Books he has written, edited, or contributed to include: Know Your Christian Life (1981) Kingdom Life in a Fallen World - Living Out the Sermon on the Mount (1986) John Owen on the Christian Life (1987) New Dictionary of Theology (Master