John Owen (1616-1683) was vice-chancellor of Oxford University and served as adviser and chaplain to Oliver Cromwell. Among the most learned and active of the Puritans in seventeenth-century England, he was accomplished both in doctrine and practical theology.

Martyn C. Cowan (PhD, University of Cambridge) is a minister of the Presbyterian church in Ireland who serves as the lecturer in historical theology and vice principal of Union Theological College, Belfast, Northern Ireland. He is the author of John Owen and the Civil War Apocalypse: Preaching, Prophecy and Politics.