John Maynard Keynes (1883-1946) is a central thinker of the twentieth century, not just an economic theorist and statesman, but also an important figure in economics, philosophy, politics, and culture. In this Very Short Introduction Lord Skidelsky, a renowned biographer of Keynes, explores his ethical and practical philosophy, his monetary thought, and provides an insight into his life and works. In the recent financial crisis Keynes's theories have become more timely than ever, and remain at the centre of political and economic discussion. With a look at his major works and his contribution to twentieth-century economic thought, Skidelsky considers Keynes's legacy on today's society.