Paul E. Benson is a Supervising Materials and Research Engineer for the California Department of Transportation and a registered civil engineer in California. He received his bachelor's and master's degrees in civil engineering at the University of California, Davis. Mr. Benson has worked in the field of air quality modeling since 1977 and has developed a nationally implemented model and published a number of papers in the field. He is Chair of the TRB Committee on Transportation and Air Quality and a member of the Committee on Energy and Environmental Aspects of Transportation of the American Society of Civil Engineers.

Robert G. Dulla is a Senior Partner at Sierra Research, Inc., an air pollution consulting firm, which he joined in 1986. Before coming to Sierra Research, he held positions of increasing responsibility at Energy and Environmental Analysis, Inc., as an Analyst, Project Manager, Director of Transportation Studies, and Partner. Before that, he was an Information Specialist with the Highway Research Board. Mr. Dulla studied mechanical engineering at Clemson University and is the author of numerous reports and technical papers on motor vehicle emissions and fuel economy. He is a member of the Air and Waste Management Association and the Society of Automotive Engineers, where he serves on the Readers Committee for papers on fuels.

Genevieve Giuliano is an Associate Professor of Urban and Regional Planning and Director of the Lusk Center Research Institute in the School of Urban and Regional Planning at the University of Southern California (USC). She received her bachelor's degree from the University of California, Berkeley, and her Ph.D. in social science from the University of California, Irvine. Before joining USC in 1988, Dr. Giuliano served as Assistant Director of the Institute of Transportation Studies at the University of California, Irvine. Her research interests include transportation policy evaluation, land use and transportation relationships, and travel behavior. She is coeditor of the international journal Urban Studies, a member of the Editorial Board of Transportation Research, and a research fellow at the Lincoln Institute of Land Policy.

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