Bertrand Russell ranks as one of the giants of twentieth-century philosophy. Through his books, journalism, correspondence and political activity he exerted a profound influence on modern thought. This companion centers on Russell's contributions to modern philosophy and, therefore, concentrates on the early part of his career. There are chapters on Russell's contributions to the foundations of mathematics, and on his development of new logical methods in philosophy and their application to such fields as epistemology, metaphysics and the philosophy of language. The intellectual background to his work is covered, as is his engagement with such contemporaries as Frege and G. E. Moore. The final chapter considers Russell as a moral philosopher. New readers will find this the most convenient and accessible guide to Russell available. Advanced students and specialists will find a conspectus of recent developments in the interpretation of Russell.