Aimee Semple McPherson (October 9, 1890 – September 27, 1944), also called Sister Aimee, was a Canadian-born evangelist and media celebrity in the 1920s and 1930s. She founded the Foursquare Church. McPherson has been noted as a pioneer in the use of modern media, especially radio, which she drew upon through the growing appeal of popular entertainment in North America.