Geoffrey Smith is Associate Professor of Biblical Greek and Christian Origins at the University of Texas at Austin. He received a PhD in Religions of Mediterranean Antiquity from Princeton University in 2013. Smith is a scholar of the New Testament and Early Christianity whose research interests include Paul and the Pauline tradition, Patristics, orthodoxy and heresy, papyrology, and Valentinianism.

He has published two books: Guilt by Association: Heresy Catalogues in Early Christianity (Oxford University Press, 2015) and Valentinian Christianity: Texts and Translations (University of California Press, 2020). He is currently working on a third book, coauthored with Brent Landau, The Secret Gospel of Mark: A Rogue Scholar, A Controversial Gospel of Jesus, and the Fierce Debate Over Its Authenticity.

His research has been covered by several media outlets, including CNN, the BBC, and the New York Times.