Aimee Semple McPherson (October 9, 1890 – September 27, 1944), also known as "Sister Aimee" or "Sister," was a Canaian-born evangelist and media sensation in the 1920s and 1930s; she was also the founder of the Foursquare Church. She was a pioneer in the use of modern media, especially radio, to create a form of religion that drew heavily on the appeal of popular entertainment.