AMER EL-AHRAF is Executive Vice President and Professor of Environmental Quality and Health at California State University, Dominguez Hills, and is the founding editor of California Journal of Environmental Health. He is the past president of the National Environmental Health Association, founding chairman of International Forum of the Environmental Health Faculty, and recipient of the two most prestigious awards in the field, the 1992 Mangold Award and the 1993 Snyder Award.WILLIAM V. WILLIS is Professor of Analytical Chemistry at California State University, Fullerton, where he teaches graduate and undergraduate courses in analytical and environmental chemistry. His research interests include the development of chemical methods for pollutant analysis, and he has received many grants and contracts for environmental analysis and chemical research.