John R. Kosak is a Research Associate at E. I. du Pont de Nemours & Company, Wilmington, Delaware. The holder of numerous patents, author or coauthor of several professional publications on catalytic hydrogenation and thermal analysis applications, and the editor of a volume also entitled Catalysis of Organic Reactions (Marcel Dekker, Inc.), Dr. Kosak is a member of the American Chemical Society, the Organic Reactions Catalysis Society, the Catalysis Society and the Catalysis Club of Philadelphia. He received the B.S. (1951) and M.S. (1952) degrees in chemistry from the University of Delaware, Newark, and the Ph.D. degree (1957) in organic chemistry from Michigan State University, East Lansing. Thomas A. Johnson is Principal Research Associate at Air Products and Chemicals, Inc., Allentown, Pennsylvania. The holder of numerous U.S. patents, Dr. Johnson is the author or coauthor of professional papers on the catalytic amination of alcohols over phosphate and supported metal catalysts, the catalytic amination of olefins over zeolites, modeling slurry hydrogenation, and the preparation of polyethyleneamines over phosphate catalysts. He is Cochair of the Organic Reactions Catalysis Society and a member of the Catalysis Society, the Catalysis Club of Philadelphia, and the American Chemical Society. Dr. Johnson received the B.S. degree (1959) in chemistry from Lawrence University, Appleton, Wisconsin, and the Ph.D. degree (1962) in organic chemistry from the University of Minnesota, Minneapolis.