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A collection of 16 of America's richest who answered the call to donate at least half of their fortunes. (Donors' worth from Forbes.com.)

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Warren Buffett, CEO of Berkshire Hathaway Inc. Worth: $47-billion.Nati Harnik

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Larry Ellison, Oracle CEO. Worth: $28-billion.Paul Sakuma

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Michael Bloomberg, New York Mayor. Worth: $18-billion.Pool/Bloomberg

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Paul Allen, owner of the Portland Trail Blazers and founder of SpaceShipOne. Worth: $13.5-billion.Win McNamee

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Eli Broad, art collector. Worth: $5.7-billion.Michael Caulfield

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Pierre Omidyar, EBay founder and chairman. Worth: $5.2-billion.� Tim Shaffer / Reuters

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George Lucas, director. Worth: $3-billion.LUCAS JACKSON

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David M. Rubenstein, Co-Founder and Managing Director of The Carlyle Group. Worth: $2.5-billion.� Lucas Jackson / Reuters

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Jeff Skoll, Founder/Chariman/CEO, Participant Productions. Worth: $2.4-billion.Scott Wintrow

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Philanthropist David Rockefeller. Worth: $2.2-billion.Brendan Smialowski

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Peter Peterson, Senior Chairman of the Blackstone Group. Worth: $2-billion.� Larry Downing / Reuters

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Ted Turner, Turner Enterprises Inc. Chairman. Worth: $1.8-billion.PHIL McCARTEN

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Venture capitalist John Doerr. Worth: $1.7-billion.� Dino Vournas / Reuters

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Barry Diller, IAC/InterActiveCorp CEO. Worth: $1.2-billion.RICK WILKING

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T. Boone Pickens, founder of BP Capital. Worth: $1.1-billion.PHIL McCARTEN

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