7. Soros Family Foundations
GEORGE SOROS, 77
Soros Fund Management (hedge fund)
Giving: $19.1 million
Assets: $248 million
Soros gives a lot, to a lot of causes. Recent large grants include $300,000 each to the University of Pennsylvania and the Eule Charitable Foundation.
Bonus fact: Soros' Open Society Institute, which focuses on public policy, has $859 million in assets and donated $78.4 million in its latest year.

8. Edward C. Johnson Fund
NED JOHNSON, 77
Fidelity Investments (mutual fund)
Giving: $17.5 million
Assets: $371.3 million
Johnson funds many grants for art and museums. The biggest: an $8.6 million donation to the Brookfield Arts Foundation, in Massachusetts.
Bonus fact: Gave $1 million to the Boston Common Frog Pond Foundation. The pond doubles as a public skating rink in winter.

9. Steinhardt Foundations
MICHAEL STEINHARDT, 67
WisdomTree Investments
Formerly of Steinhardt Fine Berkowitz & Co. (hedge fund)
Giving: $15.1 million
Assets: $3.1 million
Steinhardt supports a variety of Jewish causes, including Birthright Israel ($1.5 million), and has made a sizable contribution to New York University ($2.6 million).

10. Kravis Family Foundations
HENRY KRAVIS, 63
Kohlberg Kravis Roberts & Co. (private equity)
Giving: $12.8 million
Assets: $78.4 million
Establishment, anyone? Kravis contributes to the Metropolitan Museum of Art, the Museum of Modern Art, the New York Philharmonic, the Whitney Museum of American Art, and Carnegie Hall. Also, several million has gone to the Robin Hood Foundation, which fights poverty in New York City.

11. Poplar Foundation
MASON HAWKINS, 59
Longleaf Partners Funds (money management)
Giving: $12.6 million
Assets: $93.7 million
Hawkins gives to many Christian causes and churches, including $3 million to the Memphis-based Hope Christian Community Foundation.
Bonus fact: The only Tennessee foundation on the list.

12. Icahn Foundations
CARL ICAHN, 71
Icahn Partners (hedge fund)
Giving: $11.2 million
Assets: $10.5 million. Icahn bestows large gifts. He donated $5 million to Princeton University, $4.3 million to Mount Sinai Medical Center, and $1.5 million to build a stadium on Randalls Island, in New York City.
Bonus fact: Icahn Stadium opened on Randalls Island in 2005 and contains one of the top running tracks in the U.S.