and metals processing industries. At W.R. Grace & Co., Prescott held the positions of Construction Products Product Line Manager and Water Treatment Product Line Manager, in which he developed products for the construction and water treatment industries, respectively. He was also Manager-Analytical Research, involved with the chemical characterization of organic, inorganic and biological materials. Prescott earned his B.A. at Franklin and Marshall College in 1974 and his Ph.D. from The Pennsylvania State University in 1979.

Clifford Spiegelman is Professor of Statistics and Toxicology at Texas A&M University. His current research interests include calibration curves, nonparametric curve fitting, and applications of statistics, particularly to chemistry. He also serves as Adjunct Professor of Chemistry at Lamar University and previously held positions at Texas A&M University and in the Statistical Engineering Division of the National Bureau of Standards. Spiegelman serves as Section Editor for chemometrics in the Wiley Encyclopedia of Environmetrics, sat on the board of the Journal of Chemometrics, and held a number of positions within the American Statistical Association. He was awarded the ASA Section on the Environment’s Distinguished Achievement Award in 1994. Spiegelman earned a B.S. in economics, math, and statistics from the State University of New York, Buffalo, in 1970; an M.S. in managerial economics from Northwestern University in 1973; and a Ph.D. in statistics and applied mathematics from Northwestern University in 1976.

Raymond S. Voorhees oversees the research and examination programs and activities of the Physical Evidence Section, U.S. Postal Inspection Service, which is responsible for nationwide crime scene response, including bombings. He also continues to work as a forensic analyst, performing chemical, instrumental, and microscopic examinations of physical evidence, and testifying about the results of such work. Before joining the U.S. Postal Inspection Service in 1983, he spent 13 years with the Metropolitan Police Department of Washington, D.C. He served previously on the NRC Committee on Tagging Black and Smokeless Powder. Voorhees earned his B.S. in Administration of Justice from American University and his M.A. in Forensic Science at the Antioch School of Law.

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