N.J. Stat. Ann. § 18A:28-8

Any teaching staff member, under tenure of service, desiring to relinquish his position shall give the employing board of education at least 60 days written notice of his intention, unless the board shall approve of a release on shorter notice and if he fails to give such notice he shall be deemed guilty of unprofessional conduct and the commissioner may suspend his certificate for not more than one year.