This open letter — signed by Harvard and MIT-based faculty, staff, and researchers Chelsea Barabas, Christopher Bavitz, Ryan Budish, Karthik Dinakar, Cynthia Dwork, Urs Gasser, Kira Hessekiel, Joichi Ito, Ronald L. Rivest, Madars Virza, and Jonathan Zittrain — is directed to the Massachusetts Legislature to inform its consideration of risk assessment tools as part of ongoing criminal justice reform efforts in the Commonwealth.