Scott Chumbley is professor of materials science and engineering at Iowa State University, where he holds a joint appointment with Ames Laboratory, the Department of Energy laboratory at the university. His undergraduate and graduate degrees are in metallurgy and his field of expertise is materials characterization using optical and electron microscopy and x-ray diffraction. He has been the principal investigator on an FBI-funded proposal to study the effects of blast damage on the grain structure of iron and aluminum alloys and is currently working on a project funded by the Department of Justice to quantify and statistically analyze tool markings using three-dimensional profilometry. He is an active participant in the Midwest Forensic Research Center (MFRC), an educational and research center of Iowa State University whose goal is to provide resources and training assistance to law enforcement agencies in the Midwest. He holds a Ph.D. in metallurgical engineering from the University of Illinois.

Philip J. Cook is ITT/Terry Sanford professor of public policy studies and professor of economics and sociology at Duke University, where he is a former director of the Sanford Institute of Public Policy. His research covers a broad range of policy analysis, focusing on the regulation of unhealthy and unsafe behavior, including lotteries; sources of socioeconomic inequality, including the disparity in salaries between the elites in certain professions and the rest of the population; the administration of criminal justice, including the costs of the death penalty; and the prevention of alcohol-related problems through restrictions on alcohol availability. A member of the Institute of Medicine, he has written extensively on research on guns and violence, including studies on the costs and consequences of increased gun availability and the use of firearms tracing data in studying gun markets. He has a Ph.D. in economics from the University of California, Berkeley.

Daniel L. Cork is a senior program officer for the Committee on National Statistics, currently serving as study director of the Panel to Review the Programs of the Bureau of Justice Statistics and as co-study director for the Panel on the Design of the 2010 Census Program of Evaluations and Experiments (CPEX). He previously served as study director of the Panel on Residence Rules in the Decennial Census, co-study director of the Panel on Research on Future Census Methods, and program officer for the Panel to Review the 2000 Census. His research interests include quantitative criminology, particularly space-time dynamics in homicide; Bayesian statistics; and statistics in sports. He holds a B.S. degree in statistics from George Washington University and an M.S. in statistics and a joint Ph.D. in statistics and public policy from Carnegie Mellon University.

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