(a) The members of an Authority shall select from among themselves a chairman and a vice-chairman. The Authority may employ a secretary, such technical experts, and such other officers, agents, and employes, permanent or temporary, as it may require, and may determine the qualifications of such persons. Three members of an Authority shall constitute a quorum for its meetings, except that a majority of the members of the Authority then in office in a city of the first class shall constitute a quorum for meetings of such an Authority. Any Authority may employ its own counsel and legal staff. 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.

(b) In an Authority in a city of the first class, the executive director and staff with executive duties who report directly to either the executive director or members of the Authority shall serve in accordance with the terms and conditions approved in writing by the members of the Authority.