The Governor shall appoint from among the members of the council an executive committee of fifteen members, one of whom the Governor shall designate as general chairman, who shall be the chief executive officer of the council. Six members of the executive committee shall constitute a quorum. The Governor shall also appoint a director, who shall be an ex-officio member of the executive committee. The director shall, with the approval of the Governor, appoint an assistant director and such experts, statisticians, clerks, stenographers, and other assistants and employes as may be required for the proper conduct of the work of the council. The executive committee shall have power to appoint a technical advisory committee to advise on the technical phases of the planning work of the council. The members of the technical advisory committee shall serve without compensation but may receive their traveling or other expenses incurred in the performance of the work of the council.