He now stands shoulder to shoulder on that list with the likes of Bill Gates, Warren Buffett, Eli Broad, George Kaiser, Michael Bloomberg, George Lucas and others (see slideshow below).
For those interested in the charitable works of the very rich, the new Forbes 400 issue has several important stories, including a conversation on wealth and responsibility between Microsoft co-founder Bill Gates and Facebook co-founder Dustin Moskovitz and a profile of George Kaiser, the publicity-shy Oklahoma oilman who is trying to help poor kids in own back yard.