(b) The board of trustees shall appoint an executive secretary of the retirement system. The executive secretary shall be the chief administrative officer of the system; and he shall not be a member of the board. He shall perform such duties as are required of him in this article and as the board shall from time to time delegate to him. The compensation of the executive secretary shall be fixed by the board subject to the approval of the governor. He shall, with the approval of the board of trustees, employ such administrative, technical, and clerical employees as shall be required in the proper operation of the system.
(c) The state treasurer shall be treasurer of the retirement system and the custodian of its funds. All bonds and other investments purchased according to the provisions of this article shall forthwith be deposited with the state treasurer. It shall be his duty to collect the principal thereof and the interest and dividends thereon as the same become due and payable, and when so collected deposit same to the credit of the retirement system. All disbursements from the funds of the system shall be made by the state treasurer only upon written certification duly authorized by a continuing or specific resolution adopted by the board of trustees. He shall furnish the board with a statement of the retirement system securities in his safekeeping as the board shall from time to time request.
(d) The attorney general shall be the legal advisor to the board of trustees.
(e) The board of trustees shall appoint an actuary who shall be the technical advisor to the board regarding the operation of the retirement system on an actuarial basis.