Joseph John Campbell (1904–1987) was an American Professor of Literature at Sarah Lawrence College who worked in comparative mythology and comparative religion. His work covers many aspects of the human experience. Campbell's magnum opus is his book The Hero with a Thousand Faces (1949), in which he discusses his theory of the journey of the archetypal hero found in world mythologies. Since the book's publication, Campbell's theory has been applied by a wide variety of modern writers and artists. His philosophy has been summarized by his own often repeated phrase: "Follow your bliss."