This volume brings together for the first time some of the most helpful and insightful essays on the four most influential and discussed philosophers in the history of existentialism: Kierkegaard, Nietzsche, Heidegger, and Sartre. The contributors write on such topics as Kierkegaard's knight of faith and his diagnosis of the 'present age;' Nietzsche's view of morality and self-creation; Heidegger's accounts of worldhood and authenticity; and Sartre's ontology, ethics, and conception of the cogito. The essays have been selected for their higher level of scholarship and for their ability to illuminate various aspects of their subject's work. The volume is enhanced by the editor's introduction and extensive bibliography to aid further study.