N.J. Stat. Ann. § 18A:27-2

Any contract or engagement of any teaching staff member, shall cease and determine whenever the employing board of education shall ascertain by written notice received from the county or city superintendent of schools, or in any other manner, that such person is not, or has ceased to be, the holder of an appropriate certificate required by this title for such employment, notwithstanding that the term of such employment shall not then have expired.