William James (1842-1910) was both a philosopher and a psychologist, nowadays most closely associated with the pragmatic theory of truth. The essays in this Companion deal with the full range of his thought, including technical philosophical issues, religious speculation, moral philosophy and political controversies of his time. New readers and nonspecialists will find this the most convenient and accessible guide to James currently available. Advanced students and specialists will find a conspectus of recent developments in the interpretation of James.