Joanna Weill is a Principal Researcher at the Data Collaborative for Justice. She is on the Technical Assistance Team providing research support to the Mayor’s Office of Criminal Justice (MOCJ). Before joining DCJ, Joanna was a Principal Research Associate at the Center for Justice Innovation (previously the Center for Court Innovation). She also worked as an Advisor at the Behavioral Insights Team, where she helped government agencies to use behavioral science to design effective policy. Joanna holds a B.A. from Vassar College and a M.S. and Ph.D. from the University of California, Santa Cruz. Joanna has conducted research on a range of criminal justice topics, including case processing delay, bail reform, pretrial release decision-making, and the psychology of incarceration and reentry.