122. David Siegel
The cofounders of Two Sigma Investments, a data-driven hedge fund that manages $45 billion of assets, Overdeck and Siegel worked together at hedge fund D.E. Shaw before starting the quantitative trading powerhouse in 2001. At age 16, Overdeck won a silver medal at the International Mathematical Olympiad in Poland and enrolled at Stanford. He earned a degree in math and was on his way to getting a master’s in statistics. But in 1992, Overdeck left academia after being recruited by D.E. Shaw. He later joined one of its alums, Jeff Bezos, at Amazon for 2 years and finished his master’s in 2014. Cofounder Siegel got his PH.D. in computer science and once started a personal financial services website.