Susan Keating Glaspell (July 1, 1876 - July 27, 1948) was an American Pulitzer Prize-winning playwright, actress, director, novelist, biographer, and journalist. A best-selling author in her own time, Glaspell's novels fell out of print after her death, during which time she was remembered primarily for discovering Eugene O'Neil, and for Trifles (1916), a one-act play frequently cited as one of the greatest works of American theater. Critical reassessment has led to renewed interest in her career, and she is today recognized as a pioneering feminist writer and America's first important modern female playwright.