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48. Peter Lewis

Progressive Insurance chairman

2004-08 Giving* $206 million

Lewis counts the Center For American Progress, a liberal think tank in Washington, D.C., as one of his current causes. Over the years he has also given or pledged more $220 million to his alma mater, Princeton University, and millions more to the Solomon R. Guggenheim Museum in New York City. Lewis has also given to social reform, environmental, and youth groups.

*Based on public records and interviews with donors
Data: BusinessWeek, The Chronicle of Philanthropy and the Center on Philanthropy at Indiana University

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