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Marilyn Simons
Status
Born in 1950. Living in East Setauket, New York.
Criminal status: No personal convictions
Summary
Marilyn Simons is an American economist and philanthropist who co-founded the Simons Foundation in 1994 with her late husband James Simons, a mathematician and hedge fund pioneer. She holds a bachelor's and doctoral degree in economics from Stony Brook University and served as the foundation's founding president from 1994 to 2021, continuing now as co-chair of its board of trustees. The foundation distributes USD 481 million annually in grants and holds USD 4.48 billion in total assets, making it one of the largest private science philanthropies in the United States.
Her philanthropy spans mathematics, basic sciences, autism research, and STEM education equity, built over three decades of operational leadership. She co-founded the Simons Foundation Autism Research Initiative (SFARI) in 2003 following the autism diagnosis of a family member, an initiative that now supports more than 300 investigators worldwide. In 2017, she personally co-dedicated the foundation's Flatiron Institute, a computational science research division that gives scientists permanent, grant-free positions.
In 2023, the foundation announced the largest unrestricted gift in American university history — a USD 500 million commitment to Stony Brook University, where Simons earned her doctorate. In 2024, she was elected to the American Academy of Arts and Sciences in recognition of her decades of philanthropic leadership. Since the death of James Simons in May 2024, she continues to chair the foundation.
Business Relationships
Marilyn Simons chairs the board of trustees at Cold Spring Harbor Laboratory, a position she has held since 2019. She co-founded Math for America in 2004 alongside James Simons, an organization that now supports nearly 1,000 STEM teachers across New York City public schools. She serves on the boards of the National Museum of Mathematics and LearningSpring School, and is an advisory board member of Sandbox Films, a documentary studio focused on science communication.
Ownership
Marilyn Simons serves as co-chair of the Simons Foundation's board of trustees, the institution through which she directs philanthropic strategy. The foundation holds USD 4.48 billion in total assets and distributes approximately USD 481 million annually in grants across mathematics, life sciences, autism research, and science education. She also oversees the MJS Foundation, a private family foundation based in New York. As chair of Cold Spring Harbor Laboratory's board of trustees since 2019, she holds direct governance authority at one of the world's leading biomedical research institutions.
Family & Heirs
James Simons, her husband and co-founder of the Simons Foundation, died on May 10, 2024, at age 86. Together they built the foundation over 30 years and co-signed its most significant philanthropic commitments, including the USD 500 million Stony Brook gift announced in 2023. Marilyn also oversees the MJS Foundation, a private family philanthropic vehicle. The Simons family's philanthropic engagement extends across multiple generations, with family members active in climate and global health philanthropy.
Evidence
2004-01-01 - 😇 - Jim and Marilyn Simons co-found Math for America with Simons Foundation as primary funder to recruit and retain STEM teachers in NYC public schools
2013-01-01 - 😇 - James and Marilyn Simons receive Carnegie Medal of Philanthropy recognizing their combined giving across mathematics, science, and autism research
2022-05-11 - 😇 - Simons Foundation gives $56.6 million to Stony Brook University to support underrepresented STEM students through the Simons STEM Scholars Program
2024-02-20 - 😇 - Simons Foundation gives $75 million to CUNY for a computational science master's program and Empire AI consortium, the largest gift in CUNY history
2024-12-31 - 😇 - Simons Foundation IRS Form 990-PF for fiscal year 2024 reports $481 million in charitable grants distributed and $4.48 billion in total assets
Analysis
Marilyn Simons' record spans three decades and multiple domains: theoretical mathematics, autism neuroscience, STEM teacher development, educational equity for underrepresented students, and climate research. The USD 481 million in annual grants flows primarily to researchers and institutions working on problems with no near-term commercial payoff. The USD 500 million Stony Brook gift is the largest unrestricted university gift in American history, directed with minimal strings toward an institution where she earned her own doctorate.
The acceleration of giving between 2022 and 2024 is notable. The USD 56.6 million STEM Scholars program, USD 100 million climate commitment, USD 500 million Stony Brook gift, and USD 75 million CUNY gift landed within 22 months. These commitments extend the original science-funding mandate into equity and climate, signaling an intentional broadening of scope under her leadership.
Separately from her philanthropy, Simons is also a major individual political donor. FEC filings show she personally contributed USD 3.24 million to Democratic party committees during the 2018 election cycle alone, including a single day in which she gave the DNC, DCCC, and DSCC their maximum allowed contributions. This pattern of large-dollar political giving under her own name, distinct from her philanthropic giving, sits alongside her record as a science funder.
Questions
The Simons Foundation's giving capacity derives entirely from James Simons' Renaissance Technologies, which was the subject of a USD 7 billion IRS settlement in 2021 over disputed tax treatment of trading profits. Does the scale and quality of the foundation's philanthropy change how we weigh the source of those funds?
The foundation's major commitments flow to elite research universities and national laboratories. Does this concentration represent the highest-leverage use of USD 481 million annually, compared to community-level organizations or direct investment in underserved populations?
James Simons died in May 2024, leaving Marilyn as sole chair of a USD 4.48 billion foundation. The 2024 CUNY gift and continuing Math for America program signal continuity — but the question of long-term leadership succession has not been publicly addressed.
Simons personally gave millions of dollars to Democratic party committees in the same years she was making record-setting philanthropic gifts. Does large-scale individual political spending by a person whose wealth also funds basic science and public universities raise a different set of concerns than the philanthropy itself?
Redemption Arc
Marilyn Simons is expanding rather than contracting her philanthropic scope. The three-year run from 2022 to 2024 produced four major gifts totaling over USD 730 million, demonstrating that the foundation is actively scaling its ambitions rather than winding down.
The pivot toward climate research — the USD 100 million New York Climate Exchange — and toward AI and computational infrastructure at public universities signals a forward-looking agenda. The STEM Scholars program for underrepresented students represents a meaningful evolution from pure research funding toward equity. The direction is clearly positive.