The board of trustees shall elect from its membership a chairman and shall by a majority vote of all its members appoint a director and assistant directors. The board of trustees shall engage such actuarial and other service as shall be required to transact the business of the retirement system. The compensation of all persons engaged by the board of trustees and all other expenses of the board necessary for the operation of the retirement system shall be paid at such rates and in such amounts as the board of trustees shall approve.
La. Consolidated Public Retirement § 11:830