From the bestselling coauthor of Wittgenstein’s Poker, an entertaining and illuminating biography of a brilliant philosopher who tried to rescue morality from nihilismDerek Parfit (1942–2017) is the most famous philosopher most people have never heard of. Widely regarded as one of the greatest moral thinkers of the past hundred years, Parfit was anything but a public intellectual. He always wore gray trousers and a white shirt so as not to lose precious time picking out clothes, he varied his diet as little as possible, and he had only one serious non-philosophical interest: taking photos of Oxford, Venice, and St. Petersburg. In the latter half of his life, he single-mindedly devoted himself to a desperate attempt to rescue secular morality—morality without God—by arguing that it has an objective, rational basis. For Parfit, the stakes could scarcely have been higher. If he couldn’t demonstrate that there are objective facts about right and wrong, he believed, his life was futile and all our lives were meaningless.Connecting Parfit’s work and life and offering a clear introduction to his profound and challenging ideas, Parfit is a powerful portrait of an extraordinary thinker who continues to have a remarkable influence on the world of ideas.