N.J. Stat. Ann. § 14A:17-4

This act shall not apply to any individual or groups within this State who, prior to the passage of this act, were permitted to organize a corporation and perform personal services to the public by the means of a corporation, and this act shall not apply to any corporations organized by such individual or group of individuals prior to the passage of this act; provided, however, any such individual or group of individuals or any such corporation may bring themselves and such corporation within the provisions of this act by amending the certificate of incorporation in such a manner so as to be consistent with all the provisions of this act and by affirmatively stating in the amended certificate of incorporation that the shareholders have elected to bring the corporation within the provisions of this act.