Jean-Paul Sartre’s philosophy, particularly his emphasis on freedom and individual choice, played a significant role in shaping post-World War II thought. In his 1945 lecture “Existentialism Is a Humanism,” Sartre introduced existentialism to a broader audience, arguing that humans create their essence through free choices, which not only define the individual but also carry universal responsibility. This new edition of his lecture includes a fresh English translation, an analysis of Camus’s The Stranger, and commentary by Sartre biographer Annie Cohen-Solal.