Anyway, about the top 50 who are based on the US east coast or west coast, about half were Jewish. Some cases were debatable. For example, Ken Griffin (not Jewish) made is his fortune in Chicago but now operates out of Miami, which has become a de facto east coast city, culturally as well as geographically, through the movement of finance jobs from New York. So he increases the denominator but not the numerator.

Outside of that, vanishingly rare. Michael Dell might count as a middle American Jewish billionaire since he started in Austin, no other possibilities. In all the rest of the world, I found two French billionaires, the Wertheim brothers who own Chanel. That was it. White, Asian or Hispanic billionaires entirely filling out the rest of the top 50.

(http://www.autoadmit.com/thread.php?thread_id=5738218&forum_id=2:#49018163)