 Overlea Secondary School, the third high school in the former East York, opened its doors in 1972 with 250 students as one of the first open concept schools in Canada.On September 4, 1973 it had 400 pupils and 42 staff.On October 16, 1987, Overlea S.S. was renamed 'Marc Garneau Collegiate Institute' after Canada's first astronaut Marc Garneau, who regularly visits the school and its students.