William Edgar (DThéol, Université de Genève) is professor of apologetics and coordinator of the apologetics department at Westminster Theological Seminary in Philadelphia as well as professeur associé at the Faculté Jean Calvin in Aix-en-Provence, France. He is the author of several books, including Created and Creating: A Biblical Theology of Culture; Reasons of the Heart: Recovering Christian Persuasion; Does Christianity Really Work?; The Christian Mind: Escaping Futility; A Transforming Vision: The Lord's Prayer as a Lens for Life; Francis Schaeffer on the Christian Life; and Christian Apologetics Past and Present.