The Mental Health Commission shall appoint and remove a State Director of Mental Health, who is the chief executive of the State Department of Mental Health. Subject to the supervision and control of the Mental Health Commission, the state director shall administer the policies and regulations established by the commission. The director must be a person of proven executive and administrative ability with appropriate education and substantial experience in the field of mental illness treatment. The director must appoint and remove all other officers and employees of the Department of Mental Health, subject to the approval of the Mental Health Commission.