Bill Drayton is chairman and CEO of Ashoka, the largest network of leading social entrepreneurs in the world. As a student at Harvard, Oxford, and Yale Law School, he founded a number of organizations, including Yale Legislative Services and Harvard’s Ashoka Table, a weekly forum with practical change leaders. He was a consultant with McKinsey, where he helped develop the public practice, for the first half of the 1970s and again in the first half of the 1980s. After teaching at Stanford Law School and Harvard’s Kennedy School, he served as assistant administrator of the US Environmental Protection Agency, where he created emissions trading and many other reforms. He went on leave in 1985 after winning a MacArthur “Genius” Fellowship, which allowed him to devote himself fully to Ashoka, which he had launched in India in 1980, and to other social ventures.