Passionate about Early Childhood Education at Montessori School at Lone Tree. Are you passionate about working with children aged 2 1/2 - 6 years old. Montessori School at Lone Tree is currently seeking an Early Childhood Assistant to join our warm and loving four-classroom school, established in 1985. Responsibilities. Work in a Montessori Primary Classroom from either 7:30 AM to 1:30 PM or 10:30 AM to 4:30 PM. Demonstrate dependability, profess...