By far the biggest portion went to global health, where grants totaling more than $1.8 billion were made in 2009. Since 1994, the foundation has made grants... See all stories on this topic »
A part of a series produced by The Huffington Post in celebration of #GivingTuesday, which will take place this year on December 3, Kathy Calvin and Henry Timms vouch that we are living in a new era of philanthropy.