The executive director shall perform any and all duties that the Board shall assign him. The salary of the executive director shall be determined by the Board and, in addition, he shall be reimbursed for all actual and necessary expenses incurred by him in discharge of his official duties. The executive director shall keep records of all proceedings of the Board and shall preserve all records, books, documents and other papers belonging to the Board or entrusted to its care. The executive director shall devote his full time to the duties of the office and shall not hold any other office or employment.