After 40 years teaching graduate courses in Latin Scholasticism at St. Louis University, John P. Doyle retired as Professor Emeritus of Philosophy. He is now Distinguished Professor of Philosophy at Kenrick-Glennon Seminary in Shrewsbury, Missouri. In addition to the present volumes, he has published six more volumes of translations and has produced over 50 articles, essays, and encyclopedia entries, all dealing with figures and themes in medieval and post-medieval philosophy.