My Philosophical Development is Russell's intellectual autobiography and provides a fascinating insight into the extraordinary energy and philosophical ambition that saw him write over 40 books. As well as offering some fascinating glimpses into the changing nature of his philosophical beliefs, Russell also reflects on the fundamental themes that governed his thinking in later life.Beginning with an account of his decisive turn against the philosophical idealism that was prevalent in Cambridge at the turn of the century, Russell takes us through his engagement with the foundations of mathematics and the writing, with A.N. Whitehead, of Principia Mathematica. Russell also provides important insights into his theory of knowledge and the mind and conscious experience, before finishing with reflections on his work on language, universals and particulars and his theory of truth. An ideal philosophical companion to Russell's own Autobiography, My Philosophical Development is testament to one of the greatest minds of the 20th century. This Routledge Classics edition includes a new Foreword by Nicholas Griffin.