The school opened in September 1971 as the result of the amalgamation of two of Calgary's oldest independent schools: Strathcona School for Boys (founded in 1929) and Tweedsmuir: An Academic School for Girls (founded in 1959).
The school opened its doors in September 1971 as a consequence of the merger between two of Calgary's most historic private schools: Strathcona School for Boys, founded in 1929, and Tweedsmuir: An Academic School for Girls, established in 1959.