Bloomberg has a long, in-depth read on how a Korean-American immigrant turned billionaire, lost $20 billion dollars in just two days last month:

Bill Hwang

Before he lost it all—all $20 billion—Bill Hwang was the greatest trader you’d never heard of.

Starting in 2013, he parlayed more than $200 million left over from his shuttered hedge fund into a mind-boggling fortune by betting on stocks. Had he folded his hand in early March and cashed in, Hwang, 57, would have stood out among the world’s billionaires. There are richer men and women, of course, but their money is mostly tied up in businesses, real estate, complex investments, sports teams, and artwork. Hwang’s $20 billion net worth was almost as liquid as a government stimulus check. And then, in two short days, it was gone.

Bloomberg

You can read more at the link, but Hwang was also a large donor to the human rights group Liberty in North Korea (LiNK):

Hwang is closely involved with a group called Liberty in North Korea, or Link, that has helped about 1,300 North Koreans escaping the regime. “He doesn’t use God as a cover,” says Jensen Ko, a colleague at Archegos. “He lives that out.”