 He has been a member of the Vanderbilt University faculty since 1967 and has written a number of books and many articles over this period and before.He served as President of the Metaphysical Society of America in 1997.He is recognized as an outstanding teacher at Vanderbilt faculty, receiving the Graduate Teaching Award in 2000, the Outstanding Commitment to Teaching Freshmen Award in 1999 and the Madison Sarratt Prize for Excellence in Undergraduate Teaching in 1972.