The Donut King was a Cambodian refugee. Rags to riches, then gambled it all away.
https://story.californiasunday.com/ted-ngoy-california-doughnut-king
I’m familiar with the Donut King. There was a documentary about him or his family called Donut Dreams that came out in the 90s.
I first came across a Cambodian donut shop in LA during the mid 80s. It was only later that I learned it was a thing.