James E. Dennison is a certified industrial hygienist and owner of Century Environmental Hygiene LLC, Fort Collins, CO. Dr. Dennison received his Ph.D. in Environmental Health Toxicology from Colorado State University. His doctoral thesis involved physiologically based pharmacokinetic modeling (PBPK) of complex mixtures of gasoline in rats. He has worked with the National Advisory Committee on Acute Exposure Guideline Levels (AEGLs) performing PBPK modeling of central-nervous-system depressants to help establish AEGL values for several chemicals. He performs consulting work as a certified industrial hygienist providing advice on testing, evaluation, and control of chemical agents, such as heavy metals, solvents, pesticides, and biological materials. He currently serves as the vice chair of the Biological Monitoring Committee of the American Industrial Hygiene Association.

Jeffrey W. Fisher is co-director of the Center for Security of Agriculture and the Environment. He is also department head and professor in the Department of Environmental Health Science, College of Agricultural and Environmental Sciences at the University of Georgia (UGA). He joined UGA in 2000 and served as department head of the Department of Environmental Health Science from 2000 to 2006. He now serves as director of the Interdisciplinary Toxicology Program at UGA. He spent most of his career at the Toxicology Laboratory, Wright-Patterson Air Force Base, where he was principal investigator and senior scientist in the Toxics Hazards Division and technical advisor for the Operational Toxicology Branch. Dr. Fisher’s research interests are in the development and application of biologically based mathematical models to ascertain health risks from environmental and occupational chemical exposures. His modeling experience includes working with chlorinated and nonchlorinated solvents, fuels, PCB, pyrethroids and perchlorate. Dr. Fisher has published over 100 papers on pharmacokinetics and PBPK modeling in laboratory animals and humans. He has served on several panels and advisory boards for the DOD, Agency for Toxic Substances and Disease Registry, EPA, and nonprofit organizations. He is a member of the NRC Committee on Toxicology’s Committee on Acute Exposure Guideline Levels (2004 to present) and is a fellow of the Academy of Toxicological Sciences.

James J. McGrath is professor emeritus at Texas Tech University Health Sciences Center, Lubbock. He received his Ph.D. from Indiana University in 1968. Dr. McGrath served at EPA’s Office of Risk Assessment and was awarded a Silver Star in recognition of work in evaluating the world’s health and toxicology literature for relevancy to standard setting for diesel exhausts and worked on Air Quality Criteria for Carbon Monoxide. He also served as a consultant for indoor air quality for EPA’s new campus. He served as a principal author for EPA’s Air Quality Criteria for Particulate Matter. He is serving (or has served) on the editorial boards of American Journal of Physiology, Science, Molecular Pharmacology, Journal of Applied Toxicology, Journal of Toxicology and Environmental Health, Toxicology Letters, and CRC Press. He has served on the Society of Toxicology’s inhalation toxicology specialty section.

Chiu-Wing Lam is a senior scientist–toxicologist with Wyle Laboratories in Houston, working for the Johnson Space Center Toxicology Group. He received his Ph.D. in toxicology from the University of Rochester in 1983. He is a diplomat of the American Board of Toxicology. He has drafted numerous toxicologic risk assessment documents on spacecraft maximum allowable concentrations (SMACs) since 1990. The SMAC values (for time durations ranging from 1 hour to 180 days) are valuable guidelines to the National Aeronautics and Space Administration for assessing air quality in its space station and space shuttle documents. He also drafted the hydrogen cyanide SMAC document. Dr. Lam has conducted numerous toxicologic assessments of payload and utility chemicals used in space shuttles and space stations, providing consultations to NASA flight surgeons, safety engineers, and payload customers on toxicologic issues, including toxicities of potential combustion products of nonmetallic materials used in the spacecraft.

George C. Rodgers is professor of pediatrics at the University of Louisville. He received his Ph.D. in 1964 from Yale University and received his M.D. in 1975 from the State University of New York, Syracuse. He is board certified in pediatrics and medical technology. He is a member of the National Advisory

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