Petros Koutrakis, Ph.D., is a professor at the Harvard School of Public Health, Head of the Exposure, Epidemiology and Risk Program and the Director of the EPA/Harvard University Center for Ambient Particle Health Effects. His research activities focus on the development of human exposure measurement techniques and the investigation of sources, transport, and the fate of air pollutants. In collaboration with his colleagues in the Environmental Chemistry Laboratory, he has developed ambient particle concentrators and high volume samplers that can be used to conduct human and animal inhalation studies. He has also developed a personal ozone monitor, a continuous fine particle measurement technique and several other sampling methods for a variety of gaseous and particulate air pollutants. These novel techniques have been used extensively by air pollution scientists and human exposure assessors in United States and worldwide. Dr. Koutrakis has conducted a number of comprehensive air pollution studies in the United States, Canada, Spain, Chile, Kuwait, Cyprus, and Greece that investigate the extent of human exposures to gaseous and particulate air pollutants. Other research interests include the assessment of particulate matter exposures and their effects on the cardiac and pulmonary health. Dr. Koutrakis is a member of national and international committees and the past Technical Editor-in-Chief of the Journal of the Air & Waste Management Association. He has published more than 170 peer reviewed papers in the areas of air quality, exposure, and health effects assessment and instrumentation. Dr. Koutrakis received his Ph.D. in Environmental Chemistry from the University of Paris in 1984.

Jacob McDonald, Ph.D., is a scientist and director of the Chemistry and Inhalation Exposure Program at Lovelace Respiratory Research Institute. He conducts research that bridges his education and experience in analytical chemistry, aerosol science, and toxicology. Dr. McDonald has experience in the aerosolization and vaporization of gases and particles for a wide range of applications. He has an interest in developing laboratory exposures that represent “real world” conditions, and conducting characterizations of these exposures that allow toxicity results to be placed in the context of human exposures to entire environmental pollutants or drug products. His work spans the study of complex mixtures, respiratory drug delivery, animal model development, and metabolism in mammals. He is a member of the American Association for Aerosol Research, the Society of Toxicology, and the American Chemical Society. Dr. McDonald served on the NRC Committee to Review the Army’s Enhanced Particulate Matter Surveillance Project Report. He earned a Ph.D. in environmental chemistry and toxicology from the University of Nevada.

Gunter Oberdörster, D.V.M., Ph.D., is a professor in the Department of Environmental Medicine at the University of Rochester, director of the University of Rochester Ultrafine Particle Center, principal investigator on a multidisciplinary research initiative in nanotoxicology, and head of the Pulmonary Core of a National Institute of Environmental Health Sciences center grant. His research focuses on the effects and underlying mechanisms of lung injury induced by inhaled nonfibrous and fibrous particles, including extrapolation modeling and risk assessment. His studies of ultrafine particles influenced the field of inhalation toxicology, raising awareness of the unique biokinetics and toxic potential of nanoscale particles. He has served on many national and international committees and is a recipient of several scientific awards. He is on the editorial boards of the Journal of Aerosol Medicine, Particle and Fibre Toxicology, Nanotoxicology, and the International Journal of Hygiene and Environmental Health and is the associate editor of Inhalation Toxicology and Environmental Health Perspectives. Dr. Oberdörster has served on several NRC committees, including the Committee for Review of the Federal Strategy to Address Environmental, Health, and Safety Research Needs for Engineered Nanoscale Materials and the Committee on Research Priorities for Airborne Particulate Matter. He earned his D.V.M. and Ph.D. (in pharmacology) from the University of Giessen, Germany.

Dorothy E. Patton, Ph.D., J.D., has more than 24 years experience with the U.S. Environmental Protection Agency (EPA) (1976–2000). She began her EPA career working as an attorney in EPA’s Office of General Council on air, pesticide, and toxic substance issues. She later moved on to positions as Director of the Office of Science Policy, Executive Director of the EPA Science Policy Council, and Executive Director of the EPA Risk Assessment Forum. In these roles she was responsible for developing and implementing risk assessment policies and practices, environmental research planning and prioritization, and long-range strategic planning. After retiring from EPA in 2000, Dr. Patton taught a course in risk assessment at the Georgetown University Public Policy Institute

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