Existentialism emphasizes individualism and the uniqueness of each person. People are born, live, choose their own course, and create the meaning of their own existence. Key themes include nothingness, anxiety, absurdity, death, and alienation. Major existentialist philosophers include Nietzsche, Kierkegaard, Buber, Heidegger, Sartre, and Greene. Existentialism in education focuses on understanding each student as an individual and encouraging personal responsibility and choice. However, some argue existentialism is difficult to fully implement in modern public classrooms.