Greg Bahnsen (1948-1995) was the scholar in residence at The Southern California Center for Christian Studies where he taught Apologetics from a distinctly Reformed perspective. Bahnsen followed the lead of his mentor Cornelius Van Til and reasoned that, apart from the Christian faith, the unbeliever cannot account for his knowledge. Bahnsen earned a B.A. in Philosophy from Westmont College, his M.Div and ThM from Westminster Theological Seminary (1973), and a PhD in epistemology (the theory of knowledge) from the University of Southern California (1978).