Twin Parks Montessori, with its three, premier Upper West Side preschools, is the largest accredited Montessori program in Manhattan and the only infant toddler program in New York State to be accredited by both the American Montessori Society (AMS) and the Middle States Commission on Elementary Schools (MSCES). We are a member of the New York State Association of Independent Schools (NYSAIS), the Independent School Admission Association of Greater New York (ISAAGNY), and the Parents League, as well as affiliate schools of Columbia University.