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St. Mary’s Catholic Secondary School was founded to serve the increasing population of the Bloor - Dufferin Catholic community. In 1984, the Metropolitan Separate School Board (now the Toronto Catholic District School Board) asked the Sisters – Faithful Companions of Jesus – to establish a secondary school under the leadership of Sister Bonnie Moser. St. Mary’s occupied the J.J. McGrand Elementary School building, located in a quiet residential neighbourhood.