Bertrand Russell was one of the greatest logicians since Aristotle, and one of the most important philosophers of the past two hundred years. In this thorough examination, Alan Ryan tells the story of Russell's "other life" as social critic, polemical journalist, antiwar activist, sage and gadfly, dissenting from Russell's insistence that there was no connection between his philosophical interests and his political allegiances. Taking readers on an entertaining journey through a career that included two spells in jail, Ryan discusses Russell's most visible campaigns--against traditional religion, against the First World War, against nuclear weapons, and against the Vietnam War, as well as his lifelong defence of liberalism in education, politics, and relations between the sexes. Throughout he emphasizes the high spirits, the aristocratic fearlessness, and the wonderful combination of wit and intelligence that Russell brought to his political writing and actions. The result is a stimulating reconsideration of one of the great intellectual radicals of our time, a remarkable man who refused to grow old, calm down, and become respectable.