French playwright, novelist, screenwriter, political activist, biographer, and literary critic. He was the father of Existentialism.
He declined the offer of a Noble Peace Prize, while his rival Albert Camus did not. He believed that writers should not become institutions.
He was a firm believer in Karl Marx's philosophies.
He was a big prankster in his school, and he forced the resignation of its director with a cartoon that he drew.
He had a lifelong open relationship with fellow philosopher and writer Simone de Beauvoir. His mother was Albert Schweitzer's first cousin.