He received his PhD from the University of Minnesota. His current research focuses on the role of interpersonal relationships (family, peer, romantic) in the development of antisocial behavior from adolescence into young adulthood. He has a particular interest in methodological and statistical issues in the study of change and development. He is currently a co-Investigator on two federally (NICHD) funded grants and a statistical consultant on several federally funded projects. He serves on the board of advisory editors for the Monographs of the Society for Research in Child Development. He recently co-edited a special issue of the Journal of Adolescence on methodological and measurement issues in the study of adolescent competence.