Patrick Hurley is Emeritus Professor of Philosophy at the University of San Diego. Among other works he is the author of A Concise Introduction to Logic which, for the past 25 years, has been the number one best seller in the field. Currently in its 13th edition, gross sales have exceeded $33 million. His Ph.D. is in the philosophy of science (physics) with a concentration in the history of philosophy. He did graduate work in mathematics and extensive undergraduate work in theology.