The governing body of the authority hereby created is a board of directors consisting of five qualified electors of the authority. All powers, rights, privileges and duties vested in or imposed upon the authority are exercised and performed by and through the board of directors; provided that the exercise of any executive, administrative and ministerial powers may be, by the board, delegated and redelegated to officers and employees of the authority. Except for the first directors appointed as provided and except for any director chosen to fill an unexpired term, the term of each director runs for six years. Each director, subject to such exceptions, shall serve a six-year term, and each director shall serve until a successor has been duly chosen and qualified.