Nan Humphrey is a senior staff officer at the Transportation Research Board (TRB), a unit of the NRC. She has been with the Studies and Information Services Division of TRB for nine years and has managed several policy studies, ranging from an evaluation of size regulations for heavy trucks on highway safety, industry productivity, traffic operations, and road wear to a strategic study of highway safety research priorities and programs to a study of data requirements to support transportation policy. Currently, she is managing a study of the effects of highway capacity improvements on air quality and energy consumption, which is jointly funded by the Federal Highway Administration, the Environmental Protection Agency, state departments of transportation (through the National Cooperative Highway Research Program), and TRB. Ms. Humphrey has a master's degree in public and private management from the Yale School of Management.
Wendy C. Lewallen is a senior project assistant in the NRC's Board on Energy and Environmental Systems. She has been with the NRC since 1993. She received her B.A. in political science, with a minor in education, from the University of Southern California and taught high school social science for two years in Long Beach, California. Mrs. Lewallen is currently studying for a master's degree in bilingual/multicultural education at George Mason University.