Forty billionaires or couples have pledged to give more than half their wealth to charity. In addition to Warren Buffett and Bill Gates, other donors are:

Paul Allen

Laura and John Arnold

Michael Bloomberg

Eli and Edythe Broad

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Michele Chan and Patrick Soon-Shiong

Barry Diller and Diane von Furstenberg

Ann and John Doerr

Larry Ellison

Barron Hilton

Jon and Karen Huntsman

Joan and Irwin Jacobs

George B. Kaiser

Elaine and Ken Langone

Gerry and Marguerite Lenfest

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Lorry I. Lokey

George Lucas

Alfred E. Mann

Bernie and Billi Marcus

Thomas S. Monaghan

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Tashia and John Morgridge

Pierre and Pam Omidyar

Bernard and Barbro Osher

Ronald Perelman

Peter G. Peterson

T. Boone Pickens

Julian H. Robertson, Jr.

David Rockefeller

David M. Rubenstein

Herb and Marion Sandler

Vicki and Roger Sant

Walter Scott Jr.

Jim and Marilyn Simons

Jeff Skoll

Tom Steyer and Kat Taylor

Jim and Virginia Stowers

Ted Turner

Sanford and Joan Weill

Shelby White

The donors hail from 13 states and the District of Columbia. New York and California had the most donors. For more on the initiative, see