Unless and until otherwise provided by the commissioner by rule, regulation or order formally adopted, each board of trustees may determine the number, qualifications, powers and duties of the officers and employees of its respective institution or agency, and their compensation except as the same is fixed by statute or otherwise determinable by law. The commissioner, with the approval of the Board of Trustees, shall appoint the chief executive officer of each institution or agency in his charge, and determine his official title. The chief executive officer shall appoint, with the approval of the commissioner, all officers and employees of the institution or agency.
N.J.S. § 30:4-3