ment of Biostatistics and the Department of Mental Health at the Johns Hopkins University Bloomberg School of Public Health. He is also a senior research scholar at the American Institutes for Research and a collaborating senior scientist at the Oregon Center for Research to Practice. For the past 20 years, he has received support from the National Institute of Mental Health and more recently from the National Institute on Drug Abuse and the Centers for Disease Control and Prevention to develop statistical methods for the design and analysis of preventive and early intervention field trials. As director of the Prevention Science and Methodology Group, Brown leads a national network of methodologists who are working on the design of preventive field trials and their analysis, particularly with advanced techniques for growth analysis, multilevel modeling, and designs for implementation research. He is the codirector of the multisite Center for Integrating Education and Prevention in Schools, which is now planning a large-scale randomized field trial in Baltimore. He is codirector of the Center for Prevention of Suicide Research at the University of Rochester and coleads randomized trials in youth prevention research. He has a Ph.D. in statistics from the University of Chicago.

Elizabeth Jane Costello is professor of medical psychology in the Department of Psychiatry and Behavioral Sciences at Duke University Medical Center and has been a faculty member of the department since 1988. She has served as director for the Psychiatric Epidemiology Training Program at the University of Pittsburgh School of Medicine. She is a member of the American College of Epidemiology and has served as council member and chair in the mental health section of the American Public Health Association. In 2007 she was president of the International Society for Research in Child and Adolescent Psychopathology and a recipient of a distinguished investigator award from the National Alliance for Research on Schizophrenia and Depression. Costello’s areas of research interest include developmental epidemiology, life-span developmental psychopathology, mental health services for children and adolescents, and clinical decision making. She has also published numerous works in refereed journals on developmental psychology and epidemiology. At the National Research Council (NRC), Costello served on the Panel on Prevention, Treatment and Control of Juvenile Crime. She has a Ph.D. in psychology from the University of London, M.Phil. and B.Sci. degrees from the London School of Economics, and an M.A. from Oxford University.

Wendy E. Keenan (Program Associate) provides administrative and research support for BCYF and its various program committees. She also helps organize planning meetings and workshops that cover current issues related to children, youth, and families. Ms. Keenan has been on the National