Preprimary Teacher to begin now or in January. Montessori Certification required. New York State certification preferred. Benefits. Montessori Interns are welcome to apply as well.The Family School (18 months-12 years) is located on Dag Hammarskjold Plaza, in close proximity to the United Nations. The Family School, celebrating 50 years, was established in an effort to provide diverse populations with a warm, inclusive Montessori environment that fosters independence, creativity and tolerance.