The members of an Authority shall select from among themselves a chairman, a vice-chairman and such other officers as the Authority may determine. An Authority may employ a secretary, an executive director, its own counsel and legal staff and such technical experts and such other agents and employes, permanent or temporary, as it may require, and may determine the qualifications and fix the compensation of such persons. Three members of an Authority shall constitute a quorum for its meetings. Members of an Authority shall not be liable personally on the bonds or other obligations of the Authority, and the rights of creditors shall be solely against such Authority. An Authority may delegate to one or more of its agents or employes such of its powers as it shall deem necessary to carry out the purposes of this act, subject always to the supervision and control of the Authority.