William Edgar 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 & Present.