N.J. Stat. § 40:37A-52
No member of the governing body of the county or any existing or potential beneficiary county shall be appointed as a member of, or employed by, an authority; but the governing body of the county may, by ordinance or resolution, as appropriate, provide that, in addition to the members appointed pursuant to section 5 of P.L. 1960, c.183 (C.40:37A-48), the county executive in the case of a county having adopted article 3 of the "Optional County Charter Law," P.L. 1972, c.154 (C.40:41A-31 et seq.), the county supervisor in the case of a county having adopted article 5 of that act (C.40:41A-59 et seq.), or the president of the board of chosen freeholders in case the county is any other type of county, shall be appointed to serve ex officio, as a non-voting member of an authority.
N.J.S. § 40:37A-52