Jim Simons

Born in 1938 in Brookline, Massachusetts, Simons showed exceptional mathematical ability early, earning a PhD in mathematics from the University of California, Berkeley at age 23. He worked as a codebreaker for the National Security Agency and became chairman of the mathematics department at Stony Brook University, where he made important contributions to differential geometry and co-authored the Chern-Simons theorem, foundational to modern theoretical physics. Simons pivoted to finance in 1978, founding what eventually became Renaissance Technologies in East Setauket, New York. In 1988 he launched the Medallion Fund, open only to Renaissance employees, which generated the most extraordinary long-term performance in investment history — approximately 66% annual returns before fees (approximately 39% net of the fund's extraordinarily high 5%/44% fee structure) over more than 30 years. Renaissance's approach was fundamentally different from both traditional fundamental investing and early quantitative methods. Simons recruited mathematicians, physicists, computer scientists, and astronomers — emphatically not economists or finance professionals — to find mathematical patterns in market data. The firm's models look for subtle statistical regularities that repeat across markets and timeframes, executing trades in microseconds. The Medallion Fund was closed to outside investors in 1993 and is now available only to Renaissance employees and their families. The firm's other funds — RIEF, RIDA, and RENAISSANCE FUND — which are open to outside investors, have performed significantly worse than Medallion, suggesting that the edge captured by the Medallion Fund cannot easily be scaled. Simons stepped back from active management of Renaissance in 2010 but remained chairman. He died in May 2024 at age 86, leaving behind a philanthropic legacy through the Simons Foundation focused on mathematics, science, and autism research.