Description. . EARLY CHILDHOOLD ASSISTANT TEACHER. Position. The Montclair Cooperative School is seeking a full-time early childhood assistant teacher (grades EA-K) to start September 2024. About the School. The Montclair Cooperative School is an independent Early Ages through Eighth grade school founded in 1963 and located in Montclair, NJ. We have an enrollment of approximately 130 students, a program that is progressive and a community that i...