(a) The commissioners shall employ an executive director who shall also be the secretary and who shall administer, manage and direct the affairs and business of the authority, subject to the policies, control and direction of the commissioners. The commissioners may employ technical experts and such other officers, agents and employees, permanent and temporary, as it may require, and shall determine their qualifications, duties and compensation. The commissioners may delegate to one or more of its agents or employees such administrative duties as it may deem proper.
(b)  The secretary shall keep a record of the proceedings of the authority and shall be custodian of all books, documents and papers filed with the authority and of its minute book and seal. He shall have authority to cause to be made copies of all minutes and other records and documents of the authority and to give certificates under the seal of the authority to the effect that such copies are true copies and all persons dealing with the authority may rely upon such certificates.