John is a Research Associate Professor within the Suzanne Dworak-Peck School of Social Work at USC. His research focuses on longitudinal and predictive modeling of the impacts of maltreatment on child and family services, and on child development. Prior to working at USC, John developed theory guided exploration methods to combine structural modeling and data-mining techniques to examine covariance structure heterogeneity. He is also interested in models of growth and change, measurement models, and studying the impact of incomplete data in biasing statistical tests. John graduated from the University of California, San Diego with BS/BA degrees in Psychology and Economics, and from the University of Southern California with a PhD in Psychology.