Dr. Clark was educated at the University of Nebraska (BA), Westminster Seminary California (MDiv), and St Anne’s College, Oxford University (DPhil). He was ordained to the ministry in the Reformed Church in the United States in 1988, where he served for ten years. He has been a minister in the United Reformed Churches in North America since 1998. He is professor emeritus of church history and historical theology at Westminster Seminary California, where he taught 1997–2026. He is the founder and president of the Heidelberg Reformation Association.

 

• A brief video introduction.

He is the author of:

• The Heidelberg Catechism: A Historical, Theological, Pastoral Commentary  (Bellingham, WA: Lexham Press 2025).
• Recovering the Reformed Confession: Our Theology, Piety, and Practice (Phillipsburg: P&R Publishing, 2008).
• Caspar Olevian and the Substance of the Covenant: The Double Benefit of Christ Rutherford Studies in Historical Theology, ed. David F. Wright (Rutherford House, 2005). Reprinted 2008 by Reformation Heritage Books in the Historical-Theological Studies series.
• Baptism, Election, and the Covenant of Grace (Reformed Fellowship, 2007).
• Discovering the Reformed Confession: Theology, Piety, and Practice (Heidelberg Reformation Association, forthcoming).

The editor of

• William Ames, A Sketch of the Christian’s Catechism. Classic Reformed Theology Series vol. 1. Trans. Todd Rester (Reformation Heritage Books, 2008).
• and contributor to Caspar Olevianus, Exposition of the Apostles’ Creed. Classic Reformed Theology Series vol. 2. Trans. Casey Carmichael, (Reformation Heritage Books, 2010).
• Johannes Cocceius, Doctrine of the Covenant and Testament of God. Classic Reformed Theology Series vol. 3. Trans. Casey Carmichael (Reformation Heritage Books, 2016).
• and contributor to Covenant, Justification, and Pastoral Ministry: Essays by the Faculty of Westminster Seminary California (P&R Publishing, 2006).

The co-editor of:

• J. H. Heidegger, Concise Marrow of Christian Theology. Classic Reformed Theology Series vol. 4. Translated by Casey Carmichael (Reformation Heritage Books, 2019).
• Robert Rollock, Commentary on Ephesians. Classic Reformed Theology Series vol. 5. Translated by Casey Carmichael (Reformation Heritage Books, 2021).
• Théodore de Bèze, Amandus Polanus von Polansdorf, and François Turrettini. Justification by Faith Alone: Selected Writings from Theodore Beza (1519-1605), Amandus Polanus (1561-1610), Francis Turretin (1623-1687).  Classic Reformed Theology Series vol. 6. Translated by Casey Carmichael (Reformation Heritage Books, 2023).

The co-editor of and contributor to:

• Always Reformed: Essays in Honor of W. Robert Godfrey (Westminster Seminary California, 2010). (Apple Books version)
• Protestant Scholasticism: Essays in Reassessment (Paternoster, 1999).

A contributor to:

• Matthew Bingham, Chris Caughey, Crawford Gribben, R. Scott Clark, and Darryl G. Hart, On Being Reformed: Debates Over A Trans-Atlantic Identity (Palgrave-Pivot, 2018).

Among his recent published essays:

• “Social Trinitarianism Is Not A Bonanza For Catholic Christians” in James P. Butler et al. ed. A Faithful Steward: Essays in Honor of Richard C. Barcellos (Broken Wharfe, 2026)
• “Why You Should Change Your Mind About Reformed Scholasticism” in Credo Magazine volume 14.1 (April 12, 2023)
• “Why I changed my mind about Thomas Aquinas: The Classical Reformed Approach to Thomas Aquinas” in Credo Magazine volume 13.2 (June 24, 2022).
• “Old Side Presbyterians and the Ordinary Means” Nicotine Theological Journal volume 16.2 (Spring 2022), 5–6.
• “God the Son and the Covenant of Grace: Caspar Olevianus On Eternal Generation, and the Substance of the Covenant of Grace,” in Credo Magazine volume 10.4 (November 29, 2020).
• “Seriously and Promiscuously: The Synod of Dort on the Free Offer of the Gospel” in Joel R. Beeke and Martin I. Klauber, ed. The Synod of Dort: Historical, Theological, and Experiential Perspectives (Göttingen: Vandenhoek & Ruprecht, 2020), 89–104.
• “Conversion,” in the Concise Theology Series, ed. Fred G. Zaspel (The Gospel Coalition, 2020).
• “Historical Theology,” in the Concise Theology Series, ed. Fred G. Zaspel (The Gospel Coalition, 2020).
• “The Synod of Dort: Keeping Venom From the Lips,” in Ordained Servant (October, 2019).
• “Classical Christian Catechesis,” in Faithful and Fruitful: Essays for Elders and Deacons, ed. William Boekestein and Steven Swets (Grand Rapids: Reformed Fellowship Inc., 2019), 107–19.
• “A House of Cards? A Response to Bingham, Cribben, and Caughey,” in Matthew Bingham, Chris Caughey, R. Scott Clark, Crawford Gribben, and D. G. Hart, On Being Reformed: Debates Over a Theological Identity (London: Palgrave-Pivot, 2018), 69–89.
• “‘Subtle Sacramentarian’ or Son? John Calvin’s Relationship to Martin Luther” Southern Baptist Journal of Theology 21.4 (2018): 35–60.
• “Law and Gospel in Early Reformed Orthodoxy: Hermeneutical Conservatism in Olevianus’ Commentary on Romans,” in Jordan J. Ballor, David S. Sytsma and Jason Zuidema editors, Church and School in Early Modern Protestantism: Studies in Honor of Richard A. Muller on the Maturation of a Theological Tradition (Leiden: Brill, 2013).
• “Christ and Covenant: Federal Theology in Orthodoxy,” in Herman Selderhuis, ed., Companion to Reformed Orthodoxy (Leiden: Brill, 2013).
• A Historical, Theological, Pastoral Commentary On The Heidelberg Catechism (Lexham Press/Logos, forthcoming).

He has written for Modern Reformation magazine, Tabletalk magazine, and The Outlook as well as for academic journals and volumes.

See a complete list of his publications.

Some favorite authors are P. G. Wodehouse, James Thurber, Dorothy Sayers, John Calvin, Louis Berkhof, Martin Luther, and Geerhardus Vos. Some of his favorite books: Johannes Wollebius, Compendium of Christian Theology; Geerhardus Vos, Biblical Theology; Francis Turretin, Institutes of Elenctic Theology; Dorothy Sayers, Creed or Chaos?; Martin Luther, The Bondage of the Will.