LOUIS D. QUIN, PhD, is an Adjunct Professor at the University of North Carolina Wilmington. Dr. Quin began his academic career in 1956 with the Department of Chemistry at Duke University, serving as department chairman from 1970 to 1976. After retiring from Duke, he went to the University of Massachusetts Amherst to head up its Chemistry Department, retiring in 1996. Dr. Quin has written 250 research papers and written or co-edited eight books on the subject of organophosphorus chemistry. JOHN A. TYRELL, PhD, is Visiting Scientist in the Department of Chemistry and Bio-chemistry at the University of North Carolina Wilmington, where he teaches Fundamentals of Heterocyclic Chemistry among other courses. Dr. Tyrell holds sixty-eight patents and has more than twenty years of industrial research experience, much of it focused on heterocyclic chemistry research at Lederle Laboratories, General Electric Plastics, and OxyChem.