Since 2010, Block has been full-time director of the UVA Law clinic that provides law students with the training and opportunity to represent low-income children involved with, or at risk of involvement with, the juvenile justice system. He has also served as associate professor of law, teaching the clinic’s classroom component and other related subject matter. In addition, Block founded and directed for 12 years the Charlottesville-based JustChildren Program of the Legal Aid Justice Center. The program, which supervises some of the clinic’s students each year, provides direct representation to individual children and families, while also working on a statewide level to improve Virginia's public education, juvenile justice and foster care systems. JustChildren is the largest children's law program in the Commonwealth. He was named director of the Virginia Department of Juvenile Justice. Gov. Terry McAuliffe announced the appointment in April 2014. Block graduated from Yale University in 1987 and from the Northwestern University School of Law in 1994.