D.C. Mayor Vincent Gray nominated the former general counsel of the city’s troubled juvenile justice agency to become its chief, making Neil Stanley the fourth Department of Youth Rehabilitation Services director in the past year. Stanley has been serving in the role since taking over in December from Robert Hildum, who returned to his previous job as director of the attorney general’s public safety division in December after Gray made clear Hildum would not get a shot at holding the job in Gray’s administration. Stanley was hired as general counsel two years ago by then-director Vincent Schiraldi, who implemented a rehabilitation-focused model of juvenile justice that critics say opened the doors for juvenile delinquents to commit high-profile murders and sometime be murdered themselves.