48. Peter Lewis

Progressive chairman

2003-07 Given or Pledged: $188 million
Favored Causes: Arts, environment, youth, social reform
Estimated Lifetime Giving*: $426 million

Lewis has given millions to his alma mater, Princeton University, and the Solomon R. Guggenheim Museum in New York City. Lewis also supports conservation groups and youth and has given generously to social reform groups such as the American Civil Liberties Union and MoveOn.org.

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