Data / Foundation grants / The G Harold & Leila Y Mathers Charitable Foundation
The G Harold & Leila Y Mathers Charitable Foundation: 103 grants to organizations, $17.3 million (tax year ended December 2024)
The G Harold & Leila Y Mathers Charitable Foundation, a private foundation in Rye Brook, NY, paid 103 grants to organizations totaling $17,273,778 in its tax year ended December 2024, according to its Form 990-PF filed with the IRS on November 14, 2025. The largest was $277,200 to Rockefeller University in New York, NY for research project.
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- EIN
- 237441901
- Based in
- Rye Brook, NY
- Assets
- $392,648,645
- Grants paid
- $17,273,778
- Tax year ended
- December 2024
Grants paid, tax year ended December 2024
From the Form 990-PF filed November 14, 2025, IRS object ID 202543189349101854. It reported $17,273,778 in grants paid; 103 grants to organizations are listed.
| Recipient | Location | Purpose | Cause | Amount | Source |
|---|---|---|---|---|---|
| Rockefeller University | New York, NY | Research project | Education | $277,200 | apps.irs.gov |
| Massachusetts Institute of Technology | Boston, MA | Research project | Education | $270,000 | apps.irs.gov |
| Yale University | New Haven, CT | Research project | $268,534 | apps.irs.gov | |
| California Institute of Technology | Pasadena, CA | Research project | Education | $264,398 | apps.irs.gov |
| Leland Stanford Junior University | Stanford, CA | Research project | $259,200 | apps.irs.gov | |
| Children's Hospital Corp (boston Children's Hospital) | Boston, MA | Research project | $256,184 | apps.irs.gov | |
| Children's Hospital Corp (boston Children's Hospital) | Boston, MA | Research project | $253,000 | apps.irs.gov | |
| Vanderbilt University Medical Center | Nashville, TN | Research project | Health care | $252,199 | apps.irs.gov |
| Case Western Reserve University | Cleveland, OH | Research project | Education | $250,000 | apps.irs.gov |
| Cleveland Clinic Foundation | Cleveland, OH | Research project | $250,000 | apps.irs.gov | |
| Cleveland Clinic Foundation | Cleveland, OH | Research project | $250,000 | apps.irs.gov | |
| Columbia University | New York, NY | Research project | $250,000 | apps.irs.gov | |
| Dana-Farber Cancer Institute | Boston, MA | Research project | Medical research | $250,000 | apps.irs.gov |
| Dana-Farber Cancer Institute | Boston, MA | Research project | Medical research | $250,000 | apps.irs.gov |
| President and Fellows of Harvard College | Boston, MA | Research project | $250,000 | apps.irs.gov | |
| Rockefeller University | New York, NY | Research project | Education | $250,000 | apps.irs.gov |
| Rockefeller University | New York, NY | Research project | Education | $250,000 | apps.irs.gov |
| The Wistar Institute | Philadelphia, PA | Research project | $250,000 | apps.irs.gov | |
| White Plains Hospital | White Plains, NY | General purpose | $250,000 | apps.irs.gov | |
| Whitehead Institute for Biomedical Research | Cambridge, MA | Research project | Medical research | $250,000 | apps.irs.gov |
| University of Michigan | Ann Arbor, MI | Research project | $249,984 | apps.irs.gov | |
| Boston College | Chestnut Hill, MA | Research project | $249,935 | apps.irs.gov | |
| Icahn School of Medicine at Mt Sinai | New York, NY | Research project | Education | $247,097 | apps.irs.gov |
| Weill Cornell Medical College | New York, NY | Research project | $246,187 | apps.irs.gov | |
| Weill Cornell Medical College | New York, NY | Research project | $243,987 | apps.irs.gov | |
| Duke University | Durham, NC | Research project | Education | $241,950 | apps.irs.gov |
| Dana-Farber Cancer Institute | Boston, MA | Research project | Medical research | $240,000 | apps.irs.gov |
| Massachusetts General Hospital | Boston, MA | Research project | $240,000 | apps.irs.gov | |
| President and Fellows of Harvard College | Boston, MA | Research project | $240,000 | apps.irs.gov | |
| Columbia University | New York, NY | Research project | $238,595 | apps.irs.gov | |
| Salk Institute for Biological Studies | La Jolla, CA | Research project | Science and technology | $234,692 | apps.irs.gov |
| Tufts College | Medford, MA | Research project | $233,522 | apps.irs.gov | |
| Dana-Farber Cancer Institute | Boston, MA | Research project | Medical research | $233,333 | apps.irs.gov |
| Leland Stanford Junior University | Stanford, CA | Research project | $233,333 | apps.irs.gov | |
| President and Fellows of Harvard College | Boston, MA | Research project | $233,333 | apps.irs.gov | |
| President and Fellows of Harvard College | Boston, MA | Research project | $233,333 | apps.irs.gov | |
| University of California Los Angeles | Pasadena, CA | Research project | $233,333 | apps.irs.gov | |
| Yale University | New Haven, CT | Research project | $233,333 | apps.irs.gov | |
| Cleveland Clinic Foundation | Cleveland, OH | Research project | $233,224 | apps.irs.gov | |
| California Institute of Technology | Pasadena, CA | Research project | Education | $233,153 | apps.irs.gov |
| University of California Berkeley | Berkeley, CA | Research project | $233,000 | apps.irs.gov | |
| Cuny Advanced Science Research Center | New York, NY | Research project | $231,937 | apps.irs.gov | |
| Massachusetts Institute of Technology | Boston, MA | Research project | Education | $230,869 | apps.irs.gov |
| Leland Stanford Junior University | Stanford, CA | Research project | $230,461 | apps.irs.gov | |
| Yale University | New Haven, CT | Research project | $228,252 | apps.irs.gov | |
| California Institute of Technology | Pasadena, CA | Research project | Education | $227,488 | apps.irs.gov |
| Salk Institute for Biological Studies | La Jolla, CA | Research project | Science and technology | $227,328 | apps.irs.gov |
| Children's Hospital Corp (boston Children's Hospital) | Boston, MA | Research project | $225,000 | apps.irs.gov | |
| Dana-Farber Cancer Institute | Boston, MA | Research project | Medical research | $225,000 | apps.irs.gov |
| Dana-Farber Cancer Institute | Boston, MA | Research project | Medical research | $225,000 | apps.irs.gov |
| Dana-Farber Cancer Institute | Boston, MA | Research project | Medical research | $225,000 | apps.irs.gov |
| Dana-Farber Cancer Institute | Boston, MA | Research project | Medical research | $225,000 | apps.irs.gov |
| Vanderbilt University Medical Center | Nashville, TN | Research project | Health care | $224,998 | apps.irs.gov |
| Children's Hospital Corp (boston Children's Hospital) | Boston, MA | Research project | $224,882 | apps.irs.gov | |
| Vanderbilt University Medical Center | Nashville, TN | Research project | Health care | $223,682 | apps.irs.gov |
| Children's Hospital Corp (boston Children's Hospital) | Boston, MA | Research project | $220,774 | apps.irs.gov | |
| Duke University | Durham, NC | Research project | Education | $218,846 | apps.irs.gov |
| Joslin Diabetes Center | Boston, MA | Research project | $217,051 | apps.irs.gov | |
| Memorial Sloan-Kettering Cancer Center | New York, NY | Research project | $215,103 | apps.irs.gov | |
| Beth Israel Deaconess Medical Center | New York, NY | Research project | $211,040 | apps.irs.gov | |
| Children's Hospital Corp (boston Children's Hospital) | Boston, MA | Research project | $207,899 | apps.irs.gov | |
| University of California Berkeley | Berkeley, CA | Research project | $206,176 | apps.irs.gov | |
| National Institutes of Health | North Bethesda, MD | Research project | $204,769 | apps.irs.gov | |
| University of California San Diego | La Jolla, CA | Research project | $204,174 | apps.irs.gov | |
| Cleveland Clinic Foundation | Cleveland, OH | Research project | $189,750 | apps.irs.gov | |
| The Scripps Research Institute | La Jolla, CA | Research project | Medical research | $183,334 | apps.irs.gov |
| Northwestern University | Evanston, IL | Research project | Recreation and sports | $165,994 | apps.irs.gov |
| Ut Southwestern Medical Center | Dallas, TX | Research project | $165,758 | apps.irs.gov | |
| Whitehead Institute for Biomedical Research | Cambridge, MA | Research project | Medical research | $151,611 | apps.irs.gov |
| Children's Hospital Corp (boston Children's Hospital) | Boston, MA | Research project | $149,400 | apps.irs.gov | |
| Washington University | St Louis, MO | Research project | Education | $148,987 | apps.irs.gov |
| New York University | New York, NY | Research project | Education | $135,000 | apps.irs.gov |
| Hauptman-Woodward Medical Research Institute | Buffalo, NY | Research project | Medical research | $132,711 | apps.irs.gov |
| Texas Heart Institute | Houston, TN | Research project | $84,674 | apps.irs.gov | |
| Rockefeller University | New York, NY | Research project | Education | $37,332 | apps.irs.gov |
| Yale University | New Haven, CT | Research project | $33,764 | apps.irs.gov | |
| Yale University | New Haven, CT | Research project | $31,613 | apps.irs.gov | |
| Rockefeller University | New York, NY | Research project | Education | $30,000 | apps.irs.gov |
| New York University | New York, NY | Research project | Education | $29,528 | apps.irs.gov |
| Rockefeller University | New York, NY | Research project | Education | $29,122 | apps.irs.gov |
| Massachusetts General Hospital | Boston, MA | Research project | $27,500 | apps.irs.gov | |
| Massachusetts Institute of Technology | Boston, MA | Research project | Education | $26,667 | apps.irs.gov |
| Dana-Farber Cancer Institute | Boston, MA | Research project | Medical research | $25,000 | apps.irs.gov |
| Memorial Sloan-Kettering Cancer Center | New York, NY | Research project | $25,000 | apps.irs.gov | |
| California Institute of Technology | Pasadena, CA | Research project | Education | $24,634 | apps.irs.gov |
| Cold Spring Harbor Laboratory | Cold Spring Harbor, NY | Research project | Science and technology | $23,956 | apps.irs.gov |
| Massachusetts Institute of Technology | Boston, MA | Research project | Education | $23,302 | apps.irs.gov |
| Massachusetts Institute of Technology | Boston, MA | Research project | Education | $21,259 | apps.irs.gov |
| President and Fellows of Harvard College | Boston, MA | Research project | $20,190 | apps.irs.gov | |
| Dana-Farber Cancer Institute | Boston, MA | Research project | Medical research | $20,000 | apps.irs.gov |
| Memorial Sloan-Kettering Cancer Center | New York, NY | Research project | $19,980 | apps.irs.gov | |
| MD Anderson Cancer Center | Houston, TX | Research project | $19,807 | apps.irs.gov | |
| University of Kansas Center for Research Inc | Lawrence, KS | Research project | Science and technology | $19,173 | apps.irs.gov |
| Friends of Montecito Library | Santa Barbara, CA | General purpose | $15,000 | apps.irs.gov | |
| University of Chicago | Chicago, IL | Research project | Education | $15,000 | apps.irs.gov |
| Johns Hopkins University | Baltimore, MD | Research project | $14,964 | apps.irs.gov | |
| Hospice of Santa Barbara | Santa Barbara, CA | General purpose | $10,000 | apps.irs.gov | |
| Garza County Historical Museum | Post, TX | General purpose | $8,500 | apps.irs.gov | |
| Levelland Wallace Theater | Levelland, TX | General purpose | Arts, culture and humanities | $7,500 | apps.irs.gov |
| Santa Barbara Meals On Wheels | Santa Barbara, CA | General purpose | Food, agriculture and nutrition | $7,500 | apps.irs.gov |
| South Plains College Foundation | Levelland, TX | General purpose | $7,500 | apps.irs.gov | |
| Caprock Cultural Association | Post, TX | General purpose | Arts, culture and humanities | $5,000 | apps.irs.gov |
| Scarsdale Edgemont Family Counseling Services | Scarsdale, NY | General purpose | $1,000 | apps.irs.gov |
Causes funded
From grants whose recipient has a cause.
| Cause | Granted |
|---|---|
| Education | $3,481,832 |
| Medical research | $2,635,989 |
| Health care | $700,879 |
| Science and technology | $505,149 |
| Recreation and sports | $165,994 |
| Arts, culture and humanities | $12,500 |
| Food, agriculture and nutrition | $7,500 |
States funded
| Recipient state | Granted |
|---|---|
| Massachusetts | $6,374,044 |
| New York | $3,374,775 |
| California | $3,027,204 |
| Ohio | $1,172,974 |
| Connecticut | $795,496 |
| Tennessee | $785,553 |
| North Carolina | $460,796 |
| Pennsylvania | $250,000 |
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Updated November 14, 2025. Read from IRS Form 990-PF e-file data. Public domain (U.S. government work). Grants are as each foundation reported them to the IRS on its Form 990-PF. Grants to individuals are left out. A grant has a cause only where the recipient's name and city match one organization in the IRS Business Master File, and the cause is that organization's NTEE major group. Free to reuse with credit to SpecStream under CC BY 4.0. Spot a wrong value? Write to [email protected] with the link to this page.