He originally began working with the Drs. Rolf Loeber and Magda Stouthamer-Loeber as a post-doctoral fellow on the Pittsburgh Youth Study the University of Pittsburgh in 2003, becoming Co-Director of the study in 2011. He has co-managed the last three longitudinal follow-ups of the PYS participants and led efforts to update the official criminal record database to include offenses that occurred from 2000-2011.