D.C. Code § 24-201.11
The superintendents and all other employees engaged on March 16, 1926, in the operation of the Workhouse at Occoquan in the State of Virginia, the Reformatory at Lorton in the State of Virginia, and the Washington Asylum and Jail shall after March 16, 1926, be subject to the supervision of the Department of Corrections. Each superintendent shall have the management and control of the institution to which he is appointed and shall be subordinate to the Director of the Department of Corrections. The superintendent and all other employees of each of the institutions enumerated in this section shall be appointed by the Mayor of the District of Columbia upon nomination by the Department of Corrections and shall be subject to discharge by the Mayor upon recommendation of the Department of Corrections.
D.C. Code § 24-201.11