· Private foundation
Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff Foundation
Its FY2025 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 FY2017–2025.
Where the money goes
Your grants by size, and where they go.
| Recipient | Amount |
|---|---|
| MUSEUM OF SCIENCE | $6,000 |
| NEXT FOR AUTISM | $3,000 |
| TWO TEN INTERNATIONAL FOOTWEAR FOUNDATION | $1,500 |
| FRANCISCAN HOSPITAL FOR CHILDREN | $1,000 |
| THE WINDSOR SCHOOL | $200 |
| Individual grant recipient | $200 |
| FRICK COLLECTION NEW YORK | $156 |
| THE MORGAN LIBRARY AND MUSEUM | $150 |
| MUSEUM OF FINE ARTS | $150 |
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 (FY18–18, $180) land where the poverty rate runs at 8%, against an area that typically sits at 8%. 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.
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 +37% since the first grant, against +31% for the ones you funded once.
22 repeat relationships — 6 still active in FY2025, 16 since wound down; 3 grantees were first funded in FY2025 (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 FY2025, 96% of grant dollars renewed an existing relationship; $506 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
Franciscan Hospital for Children7× · 2017–2025 · $22k · revenue +60%
Trustees of Tufts College7× · 2017–2024 · $2k · revenue +50%- BABRIMMER AND MAY SCHOOL4× · 2017–2021 · $2k · revenue +56%
Funded once
NORTHEAST ARC INCone grant, 2019 · $5k · revenue -67%- MSMA SOCIETY FOR THE PREVENTION OF CRUELTY TO CHILDRENone grant, 2017 · $1k
- TBTHE BOSTON COLLEGIATE CHARTER SCHOOLone grant, 2019 · $1k
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.
The bac is committed to provide excellence in design education grounded in practice and accessible to diverse communities.
The mission of mit is to advance knowledge and educate students in science, technology, and other areas of scholarship that will best serve the nation and the world in the 21st century.
Dartmouth College educates the most promising students and prepares them for a lifetime of learning and of responsible leadership, through a faculty dedicated to teaching and the creation of knowledge.
Organization's mission: boston university is an international, comprehensive, private research university, committed to educating students to be reflective, resourceful individuals ready to live, adapt, and lead in an interconnected world.…
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."
Research, education and general - princeton university is a private not-for-profit, non-sectarian institution of higher learning with approximately 5,700 undergraduate and 3,300 graduate students. 2,500 students graduated in the 2024-2025…
The Marine Biological Laboratory (MBL) is a world-renowned center for biological discovery and training that is notably affiliated with more than 60 Nobel Prize winners. Research is conducted by full-time faculty as well as hundreds of the…
Western new england university, a comprehensive private institution with a tradition of excellence in teaching and scholarship and a commitment to service, awards undergraduate, master's, and doctoral degrees in various departments from…
Undergraduate, graduate, and professional education and research across a broad array of academic domains.
Dickinson college provides a useful, innovative and interdisciplinary education in the liberal arts and sciences to prepare students to lead rich and fulfilling lives of engaged global citizenship
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…
Mission strengthened by more than a century and a half of dedication to academic excellence, boston college commits itself to the highest standards of teaching and research in undergraduate, graduate and professional programs and to the…
For reference, the grantee most central to the portfolio’s shape is New England Aquarium Corporation and the most unlike its peers is Earth Creative. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
Your grantees are a median of 51 years old; the field is 17. You back the established end — and your money leans older still.
The field is 20% startups (under 5 years old) — 3% of your grantees by number, and just 14% of your money.
The orgs you fund almost never close — 0.0% lost their exemption, against 12% 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.
30 grantees tracked through their own filings, 2017–2026.
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 2017–2026, not grant rows in a single year — so this will not match the grant count on the cover. 30 of the 48 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 BROWN UNIVERSITY ↗
- Who funds MUSEUM OF SCIENCE ↗
- Who funds Franciscan Hospital for Children ↗
- Who funds NEXT FOR AUTISM INC ↗
- Who funds NORTHEAST ARC INC ↗
- Who funds Trustees of Tufts College ↗
- Who funds BRIMMER AND MAY SCHOOL ↗
- Who funds Dana-Farber Cancer Institute Inc ↗
- Who funds THE WINSOR SCHOOL ↗
- Who funds MUSEUM OF FINE ARTS ↗
- Who funds EARTH CREATIVE ↗
- Who funds SUSTAINABLE SEATTLE ↗
- Who funds WORLD AGAINST TOYS CAUSING HARM INC ↗
- Who funds PAN-MASSACHUSETTS CHALLENGE INC ↗
- Who funds THE ACADEMY OF AMERICAN POETS INC ↗
- Who funds PROPRIETORS OF THE BOSTON ATHENAEUM ↗
- Who funds BIOBUILDER EDUCATIONAL FOUNDATION ↗
- Who funds THE TRUSTEES OF RESERVATIONS ↗
- Who funds COMMONWEALTH ZOOLOGICAL CORPORATION D/B/A ZOO NEW ENGLAND ↗
- Who funds NEW ENGLAND AQUARIUM CORPORATION ↗
- Who funds FATHER BILL'S & MAINSPRING INC ↗
- Who funds TENACRE COUNTRY DAY SCHOOL CORPORATION ↗
- Who funds GROW ASSOCIATES INC ↗
- Who funds GRAYWOLF PRESS ↗
- Who funds BARRY L PRICE REHABILITATION CENTER 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: Boston Foundation Inc · Eastern Bank Foundation · Yawkey Foundation II · Combined Jewish Philanthropies of Greater Boston Inc · Bny Mellon Charitable Gift Fund · Fidelity Foundation · Ge Aerospace Foundation · American Endowment Foundation · Morgan Stanley Global Impact Funding Trust Inc · Gs Donor Advised Philanthropy Fund for Wealth Management Inc · Jpmorgan Chase Foundation · Vanguard Charitable Endowment Program
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 Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff 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, a single department, or state — and drag the year to watch it move.
- Grow Associates Inc — 97% of income from government
- Northeast Arc Inc — 73% of income from government
- Father Bill's & Mainspring Inc — 24% of income from government
- Trustees of Tufts College — 13% of income from government
- New England Aquarium Corporation — 12% of income from government
- Dana-Farber Cancer Institute Inc — 7% of income from government
- The Trustees of Reservations — 2% of income from government
- Commonwealth Zoological Corporation D/B/a Zoo New England — 2% of income from government
- The Institute of Contemporary Art Inc — 1% of income from government
- Linden Ponds Inc — 1% of income from government
- Franciscan Hospital for Children — 0% of income from government
- Proprietors of the Boston Athenaeum — 0% of income from government
- Museum of Science — 0% of income from government
- Museum of Fine Arts — 0% of income from government
- Pan-Massachusetts Challenge Inc — 0% 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.
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Find your warmest path to Lawrence a & Joan E Siff Foundation F/K/A Lawrence a Siff 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.