Mich. Comp. Laws § 791.263

Sec. 63. (1) The wardens of the correctional facilities of this state shall be appointed by the director of corrections and shall be within the state civil service. The assistant director in charge of the bureau of correctional facilities shall, subject to the approval of the director, appoint personnel within the bureau as may be necessary. Members of the staff and employees of each correctional facility shall be appointed by the warden subject to the approval of the director. (2) As used in this section, "correctional facility" does not include a correctional facility described in section 20g or 20j if that facility is operated by a private contractor.