The commission shall appoint a secretary who shall serve at the pleasure of the commission. The secretary shall be a citizen and a qualified voter of this state and shall have had at least five years’ experience in business or public administration or office management. The secretary shall keep full and true records of all proceedings of the commission and copies of all rules, regulations, decisions and orders made by the commission and he shall be responsible to it for the safe custody and preservation of such records and documents. Under the direction of the commission, the secretary shall have general charge of its office, superintend its clerical business, coordinate the work of the various divisions of the department, and perform such other duties as the commission may prescribe. The secretary shall receive a salary in an amount to be fixed by the commission.