Ludwig Wittgenstein is universally recognized as one of the most original and influential philosophers of his age and as a personality of great magnetism and power. Not all who recognize his importance admire him or approve of it; his life and work are both surrounded by controversy. In this welcome reissue of his classic biographical study, complete with a brand-new Preface, Brian McGuinness traces the early years of this fascinating figure and examines the formative influences which shaped his extraordinary life.