Dr. Alvin Plantinga is an American analytic philosopher, the emeritus John A. O'Brien Professor of Philosophy at the University of Notre Dame and the inaugural holder of the Jellema Chair in Philosophy at Calvin College. Plantinga is widely-known for his work in philosophy of religion, epistemology, metaphysics and Christian apologetics. He is the author of numerous books including the influential, God and Other Minds (1967), The Nature of Necessity (1974), and the "warrant" series culminating in Warranted Christian Belief (2000). He has delivered the prestigious Gifford Lectures three times and was described by Time Magazine as "America's leading orthodox Protestant philosopher of God". More recently, Nicholas Wolterstorff commented regarding Plantinga's contributions to contemporary philosophy: "But as for the philosophy of religion and the central main philosophical disciplines of epistemology and metaphysics, his fingerprints are indeed everywhere". Dr. Plantinga has been called "the most important philosopher of religion now writing."