Dr. Chou is a Professor of Preventive Medicine. Â His research focuses on the advancement of research methodology and statistical techniques in social and health behavioral research. His research interest falls into three distinct areas: evaluation of prevention intervention of substance use among adolescents; evaluation of substance abuse treatment, and statistical and methodological application and development for prevention research. Â Dr. Chou is an internationally recognized researcher on structural equation modeling. Â He has a well-established record on the application and development of statistical models and research methodologies in prevention research, and has extensive experience in longitudinal analyses of the effects of health promotion interventions, structural equation modeling, multilevel modeling, growth curve modeling and psychometrics analysis. Â Dr. Chou received the Research Scientist Development Award and several research projects from NIH to study advanced statistical methods for prevention research. Â He has also been serving as the directors of measurement core and statistics core for four NIH funded transdisciplinary research centers based at USC. Â Dr. Chou also holds a joint appointment in School of Social Work.