· Private foundation
The Helen and Harold C Mayer Foundation
Its FY2020 filing reports that it funds preselected organizations and did not take unsolicited requests; check the foundation's own site before ruling it out.
What you funded, over time
Every grant placed by its stated purpose and the recipient’s mission, by year — across FY2017–2020.
Where the money goes
Your grants by size, and where they go.
| Recipient | Amount |
|---|---|
| Individual grant recipient | $350,844 |
| Individual grant recipient | $348,997 |
| Individual grant recipient | $342,263 |
Do your dollars go where the need is?
Each grant placed by the hardship in its grantee’s ZIP, then read against the area’s typical level.
Your human-services grants (FY17–19, $10k) land where the poverty rate runs at 15%, against an area that typically sits at 11%. 100% of those dollars go to grantees based in above-average-need neighborhoods. Most of your grants land in higher-need ZIPs.
Matched: human-services grants are those whose grantee’s IRS cause code is Human Services. Placed by people below the poverty linein the grantee’s ZIP, averaged from the tracts in that ZIP; grantee ZIP can differ from where services are delivered.
Which US states your grants reach
US grants placed by each grantee’s ZIP, which can differ from where services are actually delivered. Need from public data — U.S. Census/ACS, CDC PLACES, Eviction Lab, USDA — shown as context about the area, never attributed to your giving.
Who you back again
Which organizations you funded more than once, and which you funded a single time. Each grantee is matched to its own filings.
And the relationships you keep tend to grow: grantees you re-up on have seen median revenue of +59% since the first grant, against +47% for the ones you funded once.
38 repeat relationships — 0 still active in FY2020, 38 since wound down; 3 grantees were first funded in FY2020 (too recent to call).
How the two cohorts compare
Organizations
Total granted
Median revenue growth · since first grant
Still filing today
New vs renewed · share of each year
In FY2020, 0% of grant dollars renewed an existing relationship; $1.0M went to new ones.
Where new relationships form · theme of each grantee’s first grant
First-time = a grantee’s first year in your filing window; renewed = funded in an earlier year too. As a portfolio matures the renewed share naturally climbs — once funded, an org stays “renewable” — so the signal is the years that buck it (a new-grantee intake wave). The earliest year is left-censored: relationships that predate the data read as “new.” Theme is the grantee’s IRS cause.
Backed again, and grew
- TNThe New York Public Library Astor Lenox and Tilden Foundations3× · 2017–2019 · $17k · revenue +76%
- UJUNITED JEWISH APPEAL-FEDERATION OF JEWISH PHILANTHROPIES OF NEW YORK INC3× · 2017–2019 · $11k · revenue +39%
- CPCENTRAL PARK CONSERVANCY INC3× · 2017–2019 · $9k · revenue +76%
Funded once
- AUALS UNITED GREATER NEW YORK INCone grant, 2019 · $4k · revenue +6%
WORLD WILDLIFE FUND INCgraduatedone grant, 2019 · $2k · revenue +47%
SANCTUARY FOR FAMILIES INCgraduatedone grant, 2017 · $2k · revenue +48%
Repeat = funded in two or more distinct years; growth and survival are read from each grantee’s own subsequent IRS filings.
The map has a center of gravity: the average direction from the rest of the sector toward the organizations the foundation funds — the shape of its giving. Scoring every nonprofit along that direction surfaces the ones that look most like the portfolio. These are the closest matchesthat aren’t grantees — a resemblance in what they say they do, not a recommendation.
Nyu is a private university with approximately 60,000 matriculating students in 20 schools and institutes. nyu's primary missions are education, research and scholarship, and patient care.
Operate a state-of-the-art, world-class genomic research center that creates and uses advanced genomics to understand the genetic basis of disease. for more information, see schedule o.
The museum's mission statement is: "to discover, interpret, and disseminate - through scientific research and education - knowledge about human cultures, the natural world, and the universe."
The new york botanical garden is a museum of plants and a scientific research center devoted to the study of plants and their uses. it is the garden's mission to improve public understanding of the natural world, horticulture, and the…
The University of New Haven is a student-centered comprehensive university with an emphasis on excellence in liberal arts and professional education. Our mission is to prepare our students to lead purposeful and fulfilling lives in a…
Provide clinical instruction to and supervision of medical school students, interns and residents and, incident thereto, rendering professional services.
Provide clinical instruction to and supervision of medical school students, interns and residents and, incident thereto, rendering professional services.
Provide clinical instruction to and supervision of medical school students, interns and residents and, incident thereto, rendering professional services.
Provide clinical instruction to and supervision of medical school students, interns and residents and, incident thereto, rendering professional services.
To educate students to be ethical and socially responsible leaders in a global community.
Provide clinical instruction to and supervision of medical school students, interns and residents and, incident thereto, rendering professional services.
Education, research, medical services and other public services.
For reference, the grantee most central to the portfolio’s shape is The New York Public Library Astor Lenox and Tilden Foundations and the most unlike its peers is Wildlife Conservation Society. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
For each theme you fund, this compares how the sector’s money is shifting with how your own giving is shifting.
Sector change and giving change are each shown relative to their own range, growing (right) or shrinking (left); both normalized, so inflation isn’t mistaken for growth.
Your grantees are a median of 54 years old; the field is 18. You back the established end — and your money leans older still.
The field is 19% startups (under 5 years old) — 5% of your grantees by number, and just 9% of your money.
The orgs you fund almost never close — 0.0% lost their exemption, against 10% of the field you don’t fund.
Age = years since IRS exemption (a founding proxy). “Closed” = auto-revocation for 3 years of non-filing — a floor on closure, not proof, and bigger established orgs lapse least. Association, not causation.
40 grantees tracked through their own filings, 2017–2025.
Each one resolved to its own IRS returns and tracked year by year — your grant beside their revenue from every source. Association, dated; never a causal claim.
Counted here: distinct organizations you funded across 2017–2025, not grant rows in a single year — so this will not match the grant count on the cover. 40 of the 61 grantees resolved in that span have returns of their own we could reconcile; the rest are funded organizations whose filings we could not track year by year.
Where your money sits — by cause, then by grantee
Each org by its size and your share of it — top-left is where you’re load-bearing
Go grantee by grantee — a decade per org, and how each moved after you funded them
A decade per grantee — revenue shaded, your grants as bars, all rows on one timeline.
- Who funds The New York Public Library Astor Lenox and Tilden Foundations ↗
- Who funds UNITED JEWISH APPEAL-FEDERATION OF JEWISH PHILANTHROPIES OF NEW YORK INC ↗
- Who funds CENTRAL PARK CONSERVANCY INC ↗
- Who funds CHURCHILL SCHOOL AND CENTER ↗
- Who funds THE MOUNT SINAI HOSPITAL ↗
- Who funds UNITED HOSPITAL FUND OF NEW YORK ↗
- Who funds THE PHILHARMONIC SYMPHONY SOCIETY OF NY INC ↗
- Who funds FLORENCE GRISWOLD MUSEUM INC ↗
- Who funds PATHWAYS INC ↗
- Who funds RIVERDALE COUNTRY SCHOOL INC ↗
- Who funds THE ANIMAL MEDICAL CENTER ↗
- Who funds Wildlife Conservation Society ↗
- Who funds LIFT INC ↗
- Who funds HOLE IN THE WALL GANG FUND INC ↗
- Who funds ALS UNITED GREATER NEW YORK INC ↗
- Who funds THE AMERICAN SOCIETY FOR THE PREVENTION OF CRUELTY TO ANIMALS ↗
- Who funds CONNECTICUT AUDUBON SOCIETY INC ↗
- Who funds Lenox Hill Hospital ↗
- Who funds NATURAL RESOURCES DEFENSE COUNCIL INC ↗
- Who funds VASSAR COLLEGE ↗
- Who funds WORLD WILDLIFE FUND INC ↗
- Who funds SANCTUARY FOR FAMILIES INC ↗
- Who funds THE NEW YORK TIMES COMMUNITIES FUND ↗
- Who funds USC VERDUGO HILLS HOSPITAL FOUNDATION ↗
- Who funds UNITED STATES FUND FOR UNICEF ↗
- Who funds SEEDS OF PEACE INC ↗
- Who funds COMMUNITY SERVICE SOCIETY OF NEW YORK ↗
- Who funds SAFE HORIZON INC ↗
The grantmakers whose grantees overlap with yours far more than size alone predicts. Each orbits closer the stronger the alignment; the arcs between them show where they also fund each other. Here it reads as a tightly interlocked camp — most of these funders back each other's grantees too.
Open a dossier: Morgan Stanley Global Impact Funding Trust Inc · National Philanthropic Trust · Vanguard Charitable Endowment Program · The Bank of America Charitable Foundation Inc · Donor Advised Charitable Giving Inc · Fidelity Investments Charitable Gift Fund · Amazonsmile Foundation
Affinity is a Gamma-Poisson posterior co-funding rate, re-centered on the typical rate, so thin evidence shrinks toward no signal. A research starting point: overlap is association, not proof of shared intent.
Government reliance of your grantees
Every dot is one organization The Helen and Harold C Mayer Foundation funds. Left–right is the share of its income from government; up–down is the share from you. Bigger dots raise more. Filter to federal or a single department — and drag the year to watch it move.
- I-Park Foundation Inc — 10% of income from government
- Florence Griswold Museum Inc — 2% of income from government
- Connecticut Audubon Society Inc — 1% of income from government
Government income is each org’s traced federal awards (USASpending — grants and contracts) plus state payments (open checkbooks) as a share of its total revenue (IRS Form 990); the self-reported government-grant line (990 line 1e) is carried for cross-check: a grantee that reports government grants we could not trace to a source is left off the chart rather than shown as receiving none. An association, not a claim that your grant caused the public funding. Coverage is precision-first — a floor, not a census; state records exist for 9 states, so a grantee outside them shows no state figure (dimmed) rather than a false zero. Federal award amounts are obligations, which can span years, so a single-year share is indicative. 990 filings lag 12–24 months.
Warm introductions · Powered by PlinthPlus
How do I get to The Helen and Harold C Mayer Foundation?
Find your warmest path to The Helen and Harold C Mayer Foundation through trustees and officers whose names appear on both boards. Search for your organization and Plinth traces the shortest route it can evidence.
Each link is a name appearing on two organizations’ public IRS 990 filings, matched on that name and, where the filings support it, on location. A same-state match has geographic support, which is a second matching feature rather than confirmation that the two are one person; a cross-state one is the likeliest to be two people who share a name. Every hop shows its tier, low-confidence and distant paths are held back rather than guessed, and it is worth confirming the person before you use the introduction.