With training in human development and prevention methodology, Dr. Lockhart’s research is driven by two primary goals: 1) understand the development of health risk behavior across adolescence and adulthood; 2) develop, test, and apply statistical methods designed to characterize effects in prevention and intervention studies. In her ongoing research of impoverished adolescents’ health behaviors, Dr. Lockhart has examined how contextual transitions contribute to changes in trajectories of health risk behaviors, including substance use, delinquent behavior, and risky sexual activity. Related to this work, she is currently exploring how adolescents’ unhealthy snacking behaviors change in conjunction with social environmental changes.