Bezos would be nowhere near as rich as Buffett if it weren’t for Buffett’s philanthropy. He has donated $28.9 billion (in Berkshire Hathaway stock) to charitable foundations over the course of his lifetime. The small charitable donations Bezos has made (at least what has been publicly disclosed) are a drop in the bucket in comparison. Buffett and Microsoft founder Bill Gates, who is the world’s richest person, created the Giving Pledge in 2010, asking billionaires to donate half of their wealth to philanthropic causes. Bezos has not signed the pledge.