The Chronicle of Philanthropy has released its annual list of America's biggest donors of 2012. Take a look at the 15 most generous donors.
3. John and Laura Arnold. Donations: $423.4 million. John Arnold founded the hedge fund Centaurus; Laura Arnold is a former lawyer and businesswoman. Most of their donations have gone to the Laura and John Arnold Foundation.
Joel Page / Reuters
Philip Andrews / Reuters
Keystone Resort/Ben Lindbloom
SRI International via Wikimedia Commons
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