Douglas Groothuis, PhD, taught at Denver Seminary as professor of philosophy for more than thirty years. In 2024, he joined the faculty of Cornerstone University as its first distinguished research professor of apologetics and Christian worldview. Doug is the author of more than twenty books, including Unmasking the New Age, Walking Through Twilight: A Wife's Illness―A Philosopher's Lament, the Christian Apologetics textbook (now in its second edition), and Beyond the Wager: The Christian Brilliance of Blaise Pascal. His passion is to make the truth of Christianity known to the world through his teaching, writing, and witness.