From the BBC:

According to a global census of dollar billionaires, almost two-thirds have a university degree. That means that even for countries with a high level of graduates, billionaires are disproportionately likely to have gone to university. . . .
The educational insights are from an annual profile of the uber-rich, the Wealth-X and UBS Billionaire Census, produced by the Swiss banking group and a Singapore-based financial intelligence firm.
It examines the wealth and background of more than 2,300 billionaires – and the findings undermine the image of the wealthy as being self-taught self-starters trained on the market stall. . . .
The top 20 for universities producing billionaires is dominated by blue-chip, elite US institutions, which take 16 of the places.

— Michael R. Strain is a resident scholar and economist at the American Enterprise Institute. You can follow him on Twitter at twitter.com/MichaelRStrain.