John M.G. Barclay is Lightfoot Professor of Divinity at Durham University (UK). After undergraduate studies in Classics and Theology, and research in New Testament studies at Cambridge University, he taught at Glasgow University for 20 years, before moving to Durham in 2003, where he teaches the New Testament and early Christianity. He has published widely on ancient Judaism and the social history of early Christianity, and most recently on Paul's theology of grace, as the root of his mission to non-Jews (Paul and the Gift, 2015; more accessible version, Paul and the Power of Grace, 2020).