David Siegel is an American investor and entrepreneur known for his role as the co-founder and CEO of Two Sigma Investments, a quantitative investment management firm based in New York City. Founded in 2001, Two Sigma uses advanced technology and data analysis to drive its investment strategies, focusing on various asset classes. Siegel has a background in computer science and finance, having earned degrees from MIT and Harvard University. He has been influential in the development of algorithmic trading and is recognized for his contributions to the field of quantitative finance.