Alec Ryrie is professor of the history of Christianity at the University of Durham. His most recent books are Unbelievers: An Emotional History of Doubt (2019) and (ed.) Christianity: A Historical Atlas (2020).

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Mark A. Lamport has for nearly forty years been a professor at graduate theological schools in the United States and Europe. He is author or editor of twenty books and works from Grand Rapids, Michigan, and Fort Myers, Florida.