N.J. Stat. § 18A:6-39
The board may, with the approval of the commissioner, issue a teacher's certificate to any citizen of any other country, who has declared his intention of becoming a United States citizen and who is otherwise qualified but any such certificate shall be void, and shall be canceled by the board, if the holder thereof shall not become a United States citizen within five years of the date of its issuance, and it may be revoked within said period by the board, if the board is satisfied that the holder thereof has abandoned his efforts to become a United States citizen or has become disqualified for such citizenship but no teacher certified, pursuant to this section, shall acquire tenure unless and until United States citizenship shall have been granted to him.
N.J.S. § 18A:6-39