The G Harold & Leila Y Mathers
Rye Brook, NY · EIN 23-7441901. Reported 345 grants totalling $65.9M to 68 organizations across tax years 2021-2024. This foundation did not tell the IRS it funds only preselected organizations.
Does this foundation accept applications?
Yes -- on its own tax return. Form 990-PF asks every private foundation whether it makes grants only to organizations it selects itself. Of the 91,758 foundations in our data that made a grant and answered, 78% said yes -- and applying to those is wasted effort. The G Harold & Leila Y Mathers did not check that box on its most recent filing, which puts it in the minority that is at least open to being approached.
How big are its grants?
The median grant is $219,024. Half of everything it gave fell between $99,545 and $250,000; the smallest was $1,000 and the largest $813,103. If you are asking for materially more than the top of that range, you are asking the wrong foundation.
Every organization it funded
This is the complete list from its filings, largest first. Years funded is the number of separate tax years in which the organization received money -- more than one means a real relationship rather than a one-off.
| Organization | Location | Total received | Grants | Years funded | Last |
|---|---|---|---|---|---|
| Dana-Farber Cancer Institute | Boston, MA | $6,594,666 | 26 | 4 | 2024 |
| Yale University | New Haven, CT | $4,522,194 | 18 | 4 | 2024 |
| Rockefeller University | New York, NY | $4,304,525 | 19 | 4 | 2024 |
| Children's Hospital Corp (boston Children's Hospital) | Boston, MA | $4,277,513 | 16 | 4 | 2024 |
| Massachusetts Institute of Technology | Boston, MA | $3,939,143 | 17 | 4 | 2024 |
| California Institute of Technology | Pasadena, CA | $2,892,297 | 11 | 4 | 2024 |
| Memorial Sloan-Kettering Cancer Center | New York, NY | $2,275,500 | 12 | 4 | 2024 |
| Columbia University | New York, NY | $2,234,153 | 9 | 4 | 2024 |
| Leland Stanford Junior University | Stanford, CA | $2,140,927 | 10 | 4 | 2024 |
| Vanderbilt University Medical Center | Nashville, TN | $2,117,827 | 8 | 3 | 2024 |
| Cleveland Clinic Foundation | Cleveland, OH | $1,844,640 | 8 | 3 | 2024 |
| President and Fellows of Harvard College | Boston, MA | $1,837,144 | 8 | 4 | 2024 |
| Cold Spring Harbor Laboratory | Cold Spring Harbor, NY | $1,681,981 | 8 | 4 | 2024 |
| Whitehead Institute for Biomedical Research | Cambridge, MA | $1,316,372 | 8 | 4 | 2024 |
| New York University | New York, NY | $1,313,667 | 8 | 3 | 2024 |
| Duke University | Durham, NC | $1,229,820 | 6 | 4 | 2024 |
| MD Anderson Cancer Center | Houston, TX | $1,174,201 | 6 | 4 | 2024 |
| Salk Institute for Biological Studies | La Jolla, CA | $969,891 | 4 | 3 | 2024 |
| University of Massachusetts Medical School | Amherst, MA | $911,869 | 6 | 3 | 2023 |
| CUNY Advanced Science Research Center | New York, NY | $824,229 | 3 | 3 | 2024 |
| Icahn School of Medicine at Mt Sinai | New York, NY | $818,538 | 4 | 4 | 2024 |
| University of California San Diego | La Jolla, CA | $804,736 | 5 | 4 | 2024 |
| Albert Einstein College of Medicine | Bronx, NY | $795,000 | 6 | 3 | 2023 |
| Weill Cornell Medical College | New York, NY | $734,161 | 3 | 2 | 2024 |
| Rice University | Houston, TX | $692,161 | 5 | 3 | 2023 |
| University of California Berkeley | Berkeley, CA | $672,176 | 3 | 2 | 2024 |
| Beth Israel Deaconess Medical Center | New York, NY | $661,097 | 3 | 3 | 2024 |
| The Wistar Institute | Philadelphia, PA | $657,443 | 4 | 3 | 2024 |
| Washington University | St Louis, MO | $647,087 | 5 | 4 | 2024 |
| New York University School of Medicine | New York, NY | $592,166 | 3 | 1 | 2021 |
| University of Pennsylvania | Philadelphia, PA | $585,000 | 3 | 2 | 2023 |
| University of Kansas Center for Research Inc | Lawrence, KS | $569,548 | 4 | 4 | 2024 |
| Boston College | Chestnut Hill, MA | $551,683 | 6 | 4 | 2024 |
| The General Hospital Corp Dba Mass General Hospital | Boston, MA | $550,000 | 2 | 2 | 2022 |
| Thomas Jefferson University | Philadelphia, PA | $550,000 | 3 | 3 | 2023 |
| Massachusetts General Hospital | Boston, MA | $515,000 | 3 | 2 | 2024 |
| University of California Los Angeles | Pasadena, CA | $466,668 | 2 | 2 | 2024 |
| Brandeis University | Waltham, MA | $454,312 | 2 | 2 | 2023 |
| University of Chicago | Chicago, IL | $450,000 | 3 | 3 | 2024 |
| Carnegie Institution | Washington, DC | $433,990 | 3 | 3 | 2023 |
| Hauptman-Woodward Medical Research Institute | Buffalo, NY | $429,254 | 3 | 3 | 2024 |
| Joslin Diabetes Center | Boston, MA | $423,948 | 2 | 2 | 2024 |
| SUNY Stony Brook School of Medicine | Stony Brook, NY | $410,506 | 3 | 2 | 2022 |
| The Scripps Research Institute | La Jolla, CA | $366,668 | 2 | 2 | 2024 |
| Northwestern University | Evanston, IL | $331,988 | 2 | 2 | 2024 |
| Ut Southwestern Medical Center | Dallas, TX | $328,039 | 2 | 2 | 2024 |
| Georgia Institute of Technology | Atlanta, GA | $300,000 | 2 | 2 | 2022 |
| Texas A&m Argrilife Research | College Station, TX | $276,113 | 2 | 2 | 2022 |
| Case Western Reserve School of Medicine | Cleveland, OH | $253,033 | 2 | 2 | 2022 |
| Case Western Reserve University | Cleveland, OH | $250,000 | 1 | 1 | 2024 |
| White Plains Hospital | White Plains, NY | $250,000 | 1 | 1 | 2024 |
| University of Michigan | Ann Arbor, MI | $249,984 | 1 | 1 | 2024 |
| Tufts College | Medford, MA | $233,522 | 1 | 1 | 2024 |
| University of California San Francisco | San Francisco, CA | $233,333 | 1 | 1 | 2023 |
| Texas Heart Institute | Houston, TN | $225,637 | 2 | 2 | 2024 |
| National Institutes of Health | North Bethesda, MD | $204,769 | 1 | 1 | 2024 |
| University of Texas Houston | Houston, TX | $136,971 | 1 | 1 | 2021 |
| Fox Chase Cancer Center | Philadelphia, PA | $125,000 | 3 | 3 | 2023 |
| Friends of Montecito Library | Santa Barbara, CA | $75,000 | 4 | 4 | 2024 |
| Hospice of Santa Barbara | Santa Barbara, CA | $65,000 | 4 | 4 | 2024 |
| Santa Barbara Meals on Wheels | Santa Barbara, CA | $47,500 | 4 | 4 | 2024 |
| Garza County Historical Museum | Post, TX | $34,000 | 4 | 4 | 2024 |
| South Plains College Foundation | Levelland, TX | $30,000 | 4 | 4 | 2024 |
| Levelland Wallace Theater | Levelland, TX | $22,500 | 3 | 3 | 2024 |
| Caprock Cultural Association | Post, TX | $20,000 | 4 | 4 | 2024 |
| Johns Hopkins University | Baltimore, MD | $14,964 | 1 | 1 | 2024 |
| Wallace Theater | Levelland, TX | $7,500 | 1 | 1 | 2021 |
| Scarsdale Edgemont Family Counseling Services | Scarsdale, NY | $1,000 | 1 | 1 | 2024 |
57 of 68 (84%) received money in more than one year over the 4 years we hold.
Measured the way we measure every foundation -- what share of one year's grantees are funded again the next -- this one retains 88%, across 3 year-to-year transitions. The median foundation retains about 67%, so this one is unusually consistent. A high number means its list is close to settled and a newcomer has to displace someone; a low one means it is still moving money around, which is where an opening is.
What kind of organizations it funds
By the recipient's own IRS classification, for the 199 grants where we could identify the organization. These are assigned categories, not our guesses.
Giving by year
| Tax year | Grants | Total | Median grant |
|---|---|---|---|
| 2021 | 79 | $15.1M | $199,552 |
| 2022 | 87 | $17.1M | $227,046 |
| 2023 | 76 | $16.5M | $208,865 |
| 2024 | 103 | $17.3M | $225,000 |
Tax years, not calendar years, and the most recent year is usually incomplete -- filings arrive about a year late, so a low final year means late paperwork rather than a foundation winding down.
Already committed for future years
Form 990-PF has a separate schedule for grants approved but not yet paid. The G Harold & Leila Y Mathers has 84 of them, worth $46.6M. This is the one part of the filing that looks forward rather than back -- and it also tells you how much of the next year's budget is already spoken for.
| Organization | Location | Approved |
|---|---|---|
| Rockefeller University | New York, NY | $1,789,096 |
| Yale University | New Haven, CT | $1,495,600 |
| Dana-Farber Cancer Institute | Boston, MA | $1,480,000 |
| Columbia University | New York, NY | $1,355,825 |
| Dana-Farber Cancer Institute | Boston, MA | $1,240,000 |
| Children's Hospital Corp (boston Children's Hospital) | Boston, MA | $1,144,474 |
| Leland Stanford Junior University | Stanford, CA | $1,091,898 |
| California Institute of Technology | Pasadena, CA | $1,058,218 |
| Vanderbilt University Medical Center | Nashville, TN | $1,023,619 |
| Rockefeller University | New York, NY | $1,000,000 |
| Cold Spring Harbor Laboratory | Cold Spring Harbor, NY | $997,728 |
| President and Fellows of Harvard College | Boston, MA | $980,000 |
| President and Fellows of Harvard College | Boston, MA | $953,523 |
| Cleveland Clinic Foundation | Cleveland, OH | $921,667 |
| Washington University | St Louis, MO | $869,540 |
Where its money goes
Foundations concentrate geographically far more than their mission statements suggest. 33% of this one's giving went to organizations in Massachusetts. If you are outside its footprint, that matters more than how well your programme fits.
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Funders that support the same organizations
These funders gave to organizations this one also funded -- some private foundations, some community foundations and other grantmaking charities. Shared grantees are the strongest available signal that two funders have overlapping priorities, and a funder already backing your peers is a far warmer prospect than one that merely lists your cause.
How to approach this foundation
- Check you are its size. The median grant is $219,024. Asking for ten times that is the most common way small organizations waste a submission.
- Check you are in its geography. Its giving is concentrated in Massachusetts.
- Read the recipient list above for organizations like yours. If nothing on it resembles your work, that is a real answer, and a cheap one to get.
- Look up the current filing before writing. The 990-PF names the foundation's officers and, where one exists, its application procedure. We link it below.
Related guides
Where these numbers come from
Everything above is taken from The G Harold & Leila Y Mathers's own Form 990-PF filings, which the IRS publishes in bulk. We used 4 returns (tax years 2021-2024). Nothing here is scraped, inferred, or estimated.
Address of record on the latest return: 800 Westchester Avenue N-503, Rye Brook, NY, 10573. This is the address the foundation gave the IRS; many small foundations file through an accountant or a bank trust department, so it may not be where post to a programme officer should go.
EIN 23-7441901 · See the original filings on ProPublica · How we build this
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