From criticisms about their efforts to fight climate change to what they think of Trump, hear the philanthropists address criticisms of their work in their annual letter. At the Gates Foundation, Melinda and Bill Gates command a $40 billion endowment aimed at improving health, and eradicating hunger and poverty in developing counties. To a lesser degree, the foundation also works to improve the U.S. educational system. On average, the organization doles out more than $4 billion in grants each year.Read Full Story.