Andreas J. Köstenberger (PhD, Trinity Evangelical Divinity School) is the theologian in residence and director of the equipping center at Fellowship Raleigh, a cofounder of Biblical Foundations, and a host at Oak Tree Cottage, a hospitality and coaching ministry to Christian leaders. He is the author, editor, or translator of over sixty books, including A Theology of John's Gospel and Letters; God, Marriage, and Family; and Invitation to Biblical Interpretation.