Jean-Paul Sartre was a French philosopher, playwright, novelist, and political activist who became one of the most influential intellectuals of the 20th century. A leading figure in existentialism and phenomenology, Sartre explored themes of freedom, responsibility, and the absurdity of existence through both his philosophical works and literary fiction. His debut novel "Nausea" established his reputation as a major literary voice, depicting a man's confrontation with the meaninglessness of existence. Sartre declined the 1964 Nobel Prize in Literature, remaining committed to his belief that writers must maintain independence from institutions. His work profoundly shaped postwar European thought.