John Kenneth Galbraith (October 15, 1908 – April 29, 2006), also known as Ken Galbraith, was a Canadian-born economist, public official, and diplomat, and a leading proponent of 20th-century American liberalism. His books on economic topics were bestsellers from the 1950s through the 2000s, during which time Galbraith fulfilled the role of public intellectual. As an economist, he leaned toward post-Keynesian economics from an institutionalist perspective.Galbraith was a long-time Harvard faculty member and stayed with Harvard University for half a century as a professor of economics. He was a prolific author and wrote four dozen books, including several novels, and published more than a thousand articles and essays on various subjects. Among his works was a trilogy on economics, American Capitalism (1952), The Affluent Society (1958), and The New Industrial State (1967). Some of his work has been criticized by economists such as Milton Friedman, Paul Krugman, and Robert Solow.