Léon joined Vera in July 2010. As the lead researcher on CSC’s Los Angeles Jail Overcrowding Reduction study, he linked massive data sets from the courts, the jail, and the prosecutor’s office to develop a picture of the population in the criminal justice system and the time frames in which significant steps in case processing took place. Since then, Léon has led an implementation and impact evaluation of a case management system in Multnomah County, Oregon. He has also evaluated the College Initiative’s mentoring program (a support system for ex-prisoners entering college in New York City), and conducted fieldwork in South Sudan with the International Program. Léon came to Vera from England where he received a Bachelor of Science in psychology from the University of London and a master’s degree and PhD in criminology from the University of Cambridge. For his doctoral thesis, Léon examined perceptions and experiences of community management among a sample of paroled sex offenders and their supervising officers,with a special focus on the working relationships that developed between the two. Prior to that, Léon worked as a research assistant for the Prisons Research Center at the Institute of Criminology, University of Cambridge.