Harrison Perkins (PhD, Queen’s University Belfast; MDiv, Westminster Seminary California) is pastor of Oakland Hills Community Church (OPC), a member of the of the Heidelberg Reformation Association, a Senior Research Fellow at the Craig Center for the Study of the Westminster Standards,  online instructor in church history at Westminster Theological Seminary, a visiting lecturer in systematic theology at Edinburgh Theological Seminary, and author of Reformed Covenant Theology: A Systematic Introduction. You can read more from him at Pastor Perks.

R.Scott Clark is the President of the Heidelberg Reformation Association, the author and editor of, and contributor to several books and the author of many articles. He is professor emeritus of church history and historical theology at Westminster Seminary California, where he taught for 29 years. He also taught at Wheaton College, Reformed Theological Seminary, and Concordia University. He has hosted the Heidelblog since 2007 and the Heidelcast since 2009.

Sarah Perkins (MSc Business and Management, University of Essex; BA Art, University of Montevallo) is a pastor’s wife, married to Harrison, and artist based out of Michigan. She recently changed from full-time work in education management to being a full-time mom to their son Scott. She is the artist behind Illustrated Theology, also doing all the art for The New Geneva, and enjoys reading, travelling, and remembering and reciting useless trivia.