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The school was founded in 1883 by the Rev. Alfred G. Mortimer with the name St. Austin's Episcopal School for Boys. The name of the school was soon changed to St. Austin's Military School. In 1898, it moved to Connecticut.
While on Staten Island the school was housed in the former Garner Mansion on St. Austin's Place. The building still exists as part of the campus of Richmond University Medical Center. A nearby street named St. Austin's Place is a reminder of the school.