John is a faculty affiliate of The Human Flourishing Program at Harvard University's Institute for Quantitative Social Science. He is the former Research and Program Coordinator for the Biola University Center for Christian Thought and teaches part-time in the Department of Philosophy at Talbot School of Theology. A former pastor, he holds a Ph.D. degree from The Cook School of Intercultural Studies. His dissertation focused on deconversion from Christianity to atheism. He is the author of five books on deconversion. John is also a contributor to an updated edition of the forthcoming book Apologetics for a New Generation (Harvest House 2025). Dr. Marriott is the Director of Cultural Engagement with the Renaissance Forum which focuses on connecting calling to culture for societal wellbeing. He speaks at churches and conferences on topics related to biblical studies, philosophy of religion, deconversion, and the relationship between the Church and culture. He is also the International Student Services Coordinator at Whittier Christian High School, in Whittier California.