Jean-Paul Sartre was a 20th century French philosopher and writer who was a leading figure in existentialism. He wrote the play No Exit in 1944, set in a drawing room in hell where three damned souls - Garcin, Inez, and Estelle - are locked together as eternal torturers for one another. The climax occurs when Garcin declares "Hell is other people!" reflecting the existentialist theme that humans define themselves through their interactions with others rather than having a fixed essence.