Biography: From Wikipedia, the free encyclopedia. Ann Magnuson (born January 4, 1956) is an American actress, performance artist, and nightclub performer who first gained prominence in the 1985 film Desperately Seeking Susan. The New York Times described her as "An endearing theatrical chameleon who has as many characters at her fingertips as Lily Tomlin does". Description above from the Wikipedia article Ann Magnuson, licensed under CC-BY-SA, full list of contributors on Wikipedia.