Bill Gates

"My mom never had the opportunity to see the Giving Pledge, but I like to think she’d see her influence in its work if she could. I’m lucky that my dad—who played a huge role in shaping my philanthropy—lived to see the pledge become a reality. He used to say, 'There’s no problem bigger than we are.' I never doubted him, but the work of the Giving Pledge gives me absolute certainty that he was right."