Milton Friedman, 1912-2006
From today's WSJ editorial page:
For all of his academic accomplishments, Professor Friedman's role as a popularizer of free-market principles was arguably more important. He wrote a column in Newsweek for 18 years starting in 1966, preaching the importance of economic freedom to a generation that had never heard such things in school. His 1980 book, "Free to Choose," was a best seller, and the videos that accompanied it were smuggled behind the Iron Curtain like seeds of revolution.
Few people in human history have contributed more to the achievement of human freedom than Milton Friedman.