David M. Siegel is a computer scientist who co-founded Two Sigma Investments in 2001 with John Overdeck, building it into one of the world's largest quantitative hedge funds, managing on the order of $60 billion by applying data science, machine learning, and large-scale computing to financial markets. Trained at Princeton and with a Ph.D. from MIT's artificial intelligence lab, Siegel helped pioneer the algorithm-driven, technology-first model that now dominates much of modern trading.
Siegel's wealth, estimated around $8 billion, gives him influence well beyond markets. Through the Siegel Family Endowment, founded in 2011 and holding more than $400 million in assets, he directs grants to universities, research centers, civic-technology projects, and policy and advocacy organizations, shaping debates over technology's role in society, the future of work, and digital infrastructure.
His civic footprint runs through elite institutions -- the MIT Corporation, Cornell Tech, and the robotics nonprofit FIRST among them -- positioning him as a patron whose money and convening power help set agendas in education, research, and tech policy.
What they control
- Two Sigma Investments: a roughly $60 billion quantitative fund and its proprietary trading models and data infrastructure
- A personal fortune of about $8 billion as a Two Sigma co-founder and co-chairman
- The Siegel Family Endowment, a $400M+ foundation funding technology, research, and policy organizations
- Board and trustee seats at major institutions (MIT Corporation, Cornell Tech, FIRST) that shape research and education agendas
- A philanthropic platform influencing public debate on AI, automation, and the future of work
Key institutions & holdings
Quantitative hedge fund managing roughly $60 billion.
Grantmaking foundation (~$400M+ assets) focused on technology and society.
Governing board of his doctoral alma mater.
Tech-education and youth-robotics institutions he supports.
Key facts
- Co-founded Two Sigma in 2001 with John Overdeck; the firm manages roughly $60 billion.
- Estimated net worth of about $8 billion (2025).
- Holds a Ph.D. in computer science from MIT, where he worked in the artificial intelligence lab.
- Founded the Siegel Family Endowment in 2011; it holds more than $400 million in assets.
- Stepped back from running Two Sigma in September 2024, moving from co-CEO to co-chairman alongside Overdeck.
- Two Sigma disclosed the founders' rift as a material risk to the business in a March 2023 regulatory filing.
Timeline
- 2001Co-founds Two Sigma Investments with John Overdeck, applying data science to trading.
- 2011Establishes the Siegel Family Endowment to fund technology and society initiatives.
- 2023Two Sigma cites the deteriorating relationship between its co-founders as a material business risk in a regulatory filing.
- 2024Siegel and Overdeck step down as co-CEOs and become co-chairmen as new leadership takes over.
Controversies
Founder feud and governance risk · 2023-2024
The long-running conflict between Siegel and co-founder John Overdeck became severe enough that Two Sigma identified it as a material risk to the firm, an unusual disclosure that culminated in a 2024 leadership transition.
Opacity of algorithmic finance · ongoing
Quant funds like Two Sigma trade at scale using proprietary models that are largely invisible to the public and regulators, raising broader questions about transparency and systemic risk in markets dominated by automated strategies.
Philanthropic influence on tech policy · ongoing
Critics across the spectrum note that large private foundations such as the Siegel Family Endowment can steer university research, civic-tech projects, and policy debates in directions favored by their wealthy funders.
Network
- John OverdeckCo-founderTwo Sigma co-founder and co-chairman; the two had a well-documented falling-out.
- Two Sigma leadershipSuccessorsNew chief executives installed in 2024 to run the firm day to day.
- Siegel Family Endowment granteesAllied institutionsUniversities, research centers, and policy groups funded by his foundation.
- MIT / Cornell TechAffiliated institutionsAcademic bodies where he holds trustee and board roles.
Why this matters
Quantitative funds now move enormous sums through markets using algorithms few outsiders can scrutinize, and the founders of those funds convert their winnings into foundations that fund the very universities and policy shops shaping how society governs technology. That gives a single data scientist outsized, hard-to-track influence over both financial markets and the public conversation about AI and the future of work.