The Director of the Department of Mental Health may appoint a superintendent of each hospital, with the approval of the Mental Health Commission. Each superintendent shall be knowledgeable in the treatment of the mentally ill and in hospital administration. The superintendent of each institution under the jurisdiction of the Department of Mental Health shall be responsible for the employment of all personnel at the institution, subject to the approval of the director of the department. The director may serve as superintendent of one or more hospitals or other mental health facilities.