John Dewey (1859–1952) was a major figure of the American cultural and intellectual landscape in the first half of the twentieth century. While not the originator of American pragmatism, he was instrumental to its articulation as a philosophy and the spread of its influence beyond philosophy to other disciplines. His prolific writings encompass metaphysics, philosophy of mind, cognitive science, psychology, moral philosophy, the philosophies of religion, art, and education, and democratic political and international theory. The contributors to this Companion examine the wide range of Dewey's thought and provide a critical evaluation of his philosophy and its lasting influence, both elsewhere in philosophy and on other disciplines.