Dr. Yih-Ing Hser is Professor-in-Residence in the Department of Psychiatry and Behavioral Sciences at the UCLA Integrated Substance Abuse Programs and the Director of the Center for Advancing Longitudinal Drug Abuse Research. As a trained quantitative psychologist, she has extensive experience in health services research, treatment evaluation, and long-term follow-up research, derived from her prior and ongoing research projects. She has been conducting research in the field of substance abuse and its treatment since 1980 and has extensive experience in research design and advanced statistical techniques applied to substance abuse data. In addition to gender-related issues in substance abuse and treatment, Dr. Hser has published in the areas of treatment evaluation, epidemiology, natural history of drug addiction, and innovative statistical modeling development and application.