Li Ka-shin is another good answer. https://en.wikipedia.org/wiki/Li_Ka-shing who gained a bunch of money like Bill Gates and started his own foundation: https://en.wikipedia.org/wiki/Li_Ka_Shing_Foundation which works towards education reform, the foundation constantly builds and donates to universities to help them further the reach of impoverished students. Additionally, they support a lot of medical services and research to help impoverished areas of HK.

I don't know current ms ceo?

Chuck Feeney

All have turned aside; together they have become worthless; no one does good, not even one. Romans 3:12

You're right. There's no billionaire who has done good. But there's also no human who has done good either.

How about no? Stop deepthroating billionaires, please.

Elon Musk. Without him, electric cars wouldn't be the almost-mainstream thing they are today. We also would be a decade behind on space launch.

JK Rowling donated so much money that she's no longer a billionaire!