The prominent philosopher born in 1928 known for contributions to existentialism and the philosophy of subjectivity is Jean-Paul Sartre. Sartre was a leading figure in 20th-century philosophy and literature, famous for his key ideas about freedom, responsibility, and the nature of existence. His influential works, such as "Being and Nothingness," explore the complexities of human experience and the choices individuals make. Sartre's thoughts have had a lasting impact on philosophy, literature, and political theory, solidifying his status as a cultural icon.