The Chronicle of Philanthropy has released its list of America's biggest donors of 2013. Take a look at the 15 most generous donors.
4. Michael Bloomberg. Donations: $452 million. Bloomberg founded the financial data and news company that bears his name. He is also the former mayor of New York City. He primarily gave to arts, education, public health and environmental groups.
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National Portrait Gallery, London
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Greg M. Cooper-USA TODAY Sports/Reuters
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