Founded in 1961, TMS is an internationally recognized leading independent school that combines the Montessori and International Baccalaureate frameworks to provide students the foundation for a life of goodness and excellence. TMS has two exceptional campuses in Richmond Hill. The Lower School offers a Montessori start for students from 18 months to Grade 6. The Upper School is the only independent school in York Region that offers the International Baccalaureate Programme. TMS is a member of CIS and accredited by CAIS, CCMA, and IBO.