[turar]

Buffett is working for his shareholders to increase the value of their investment in Berkshire Hathaway in the best possible way.

Personally though, he already gave away most of his wealth to philanthropy via Gates Foundation.

[MikeCapone]

99%+ of his wealth is in Berkshire, though, so the better Berkshire does, the more billions will go to Gates and a few other foundations (mostly run by his kids).

[turar]

Yes. Gates Foundation works on various philanthropic causes, notably global health issues.