The Board may appoint a general manager who shall be a person of recognized ability and business experience to hold office during the pleasure of the Board. The general manager shall have management of the properties and business of the Port District and the employees thereof subject to the general control of the Board, shall direct the enforcement of all ordinances, resolutions, rules and regulations of the Board, and shall perform such other duties as may be prescribed from time to time by the Board. The Board may appoint a general attorney and a chief engineer, and shall provide for the appointment of other officers, attorneys, engineers, consultants, agents and employees when necessary. It shall define their duties and require bonds of such of them as the Board may designate. The general manager, general attorney, chief engineer, and all other officers employed pursuant to this Section shall be exempt from taking and subscribing any oath of office and shall not be members of the Board. The compensation of the general manager, general attorney, chief engineer, and all other officers, attorneys, consultants, agents and employees shall be fixed by the Board, subject to the provisions of Section 13 of this Act.