The Board shall employ an executive director who shall serve at the pleasure of the Board. He shall direct the affairs of the Board and keep records of all proceedings, transactions, communications, and official acts of the Board. He shall be custodian of all records of the Board and perform such duties as the Board may require. The Executive Director shall call a meeting of the Board at the direction of the chairman or upon written request of three or more Board members. The Executive Director, with approval of the Board, may employ such additional staff as needed. The annual salary of the Executive Director shall be at Level II of the Executive Compensation Plan contained in the Appropriation Act.