2/6/03 
William F. Carroll, Ph.D.  '73

Vice-President, OxyChem (a division of Occidental Chemical Corp.), Dallas, Texas
Adjunct Professor of Chemistry, Indiana University
"Vinyl Chloride, Cancer and Technology

9/23/02 
Robert M. Sapolsky, Ph.D.

Department of Biology and Neurology, Stanford University
Research Associate, Institute of Primate Research
National Museums of Kenya
Author:  Why Zebras Don't Get Ulcers
"Why Zebras Don't Get Ulcers: Stress, Disease and Coping"