ogy. His current research concerns the basic questions which impact on toxicity risk and assessment using physiologically based pharmacokinetics models. He holds B.S. and M.S. degrees from the University of Texas at Austin College of Pharmacy and a Ph.D. degree from the University of Michigan.

MICHAEL I. COHEN is professor and chair of the Department of Pediatrics at Albert Einstein College of Medicine/Montefiore Medical Center. He held a postdoctoral fellowship from the National Institutes of Health at Einstein before beginning his career in exploring the issues of adolescent development. He is the former president and chief executive officer of the Montefire Medical Center in New York, served on the Council on Adolescent Development of the Carnegie Corporation of New York, and was vice-chair of an advisory committee on adolescent health to the Office of Technology Assessment, U.S. Congress. He is a member of the Institute of Medicine, and a trustee of Foundation for Child Development. He has an M.D. degree from Columbia University and did his pediatric training at Babies Hospital in New York.

NANCY A. CROWELL (study director) is a staff officer with the Commission on Behavioral and Social Sciences and Education of the National Research Council/National Academy of Sciences. She serves on the staff for the Board on Children, Youth, and Families and the Committee on Law and Justice, and she previously staffed National Research Council studies on violence against women, family violence, risk communication, and policy implications of greenhouse warming. Training as a pediatric audiogist, Crowell worked in a demonstration project for preschool hearing impaired children and their families at Ball State University. She also worked on several political campaigns and for a political polling and consulting firm prior to joining the National Research Council staff. She holds B.S. degrees in mathematics and French from St. Lawrence University and an M.A. in audiology from Vanderbilt University.

LETITIA K. DAVIS is director of the Occupational Health Surveillance Program in the Massachusetts Department of Public Health, where she works to develop state-based surveillance systems for work-related illnesses and injuries. She has overseen the formation



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