New York - Educator Preparation and Licensure: Educator Licensure Policy
3001. Qualifications of teachers. No person shall be employed or authorized to teach in the public schools of the state who is:
1. Under the age of eighteen years.
2. Not in possession of a teacher's certificate issued under the authority of this chapter or a diploma issued on the completion of a course in state college for teachers or state teachers college of this state.
3. Not a citizen. The provisions of this subdivision shall not apply, however, to an alien teacher now or hereafter employed, provided such teacher shall make due application to become a citizen and thereafter within the time prescribed by law shall become a citizen. The provisions of this subdivision shall not apply, after July first, nineteen hundred sixty-seven, to an alien teacher employed pursuant to regulations adopted by the commissioner of education permitting such employment. The citizenship requirements of this subdivision shall not apply to an alien teacher now or hereafter employed whose immigration status is that of a lawful permanent resident of the United States and who would otherwise be eligible to serve as a teacher, or to apply for or receive permanent certification as a teacher, but for the foregoing requirements of this subdivision.