· Private foundation
Steven Prewitt Skull Base Disease 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 FY2018–2025.
Where the money goes
Your grants by size, and where they go.
| Recipient | Amount |
|---|---|
| SCRIPPS HEALTH FOUNDATION | $15,800 |
| RESOURCE EXCHANGE INTERNATIONAL INC | $15,000 |
| SAN DIEGO AUTOMOTIVE MUSEUM | $10,000 |
| SAN DIEGO AIR & SPACE MUSEUM | $10,000 |
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.
Dollar for dollar, your grants (FY18–25) land where the poverty rate runs at 11%, against an area that typically sits at 11%. 93% of your 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.
5 repeat relationships — 2 still active in FY2025, 3 since wound down; 2 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, 39% of grant dollars renewed an existing relationship; $31k 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
- GHGrossmont Hospital Foundation2× · 2022–2023 · $63k · revenue +5%
- SHSharp Healthcare Foundation2× · 2020–2021 · $58k · revenue +34%
- NANORTH AMERICAN SKULL BASE SOCIETY2× · 2018–2019 · $54k · revenue +71%
Funded once
- SMSCRIPPS MERCY HOSPITAL FOUNDATIONone grant, 2024 · $15k
- SDSAN DIEGO AUTO MUSEUMone grant, 2024 · $10k
- SSSD SPACE AIR MUSEUMone grant, 2024 · $8k
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.
Sharp Memorial Hospital provides comprehensive medical services to the San Diego Community.
To operate and maintain a general acute care hospital and related facilities for the acute care of persons suffering from illnesses or disabilities, and for the continuing care of persons needing rehabilitation and the custodial care of…
Grossmont Hospital provides inpatient and outpatient medical services to the community.
MISSION STATEMENT: MISSION: CARING FOR OUR PATIENTS FIRST AND OUR PEOPLE ALWAYS. VISION: TO BE THE MOST COMPREHENSIVE, INTEGRATED AND CONNECTED HEALTH SYSTEM FOR GETTING AND STAYING WELL. VALUES: EXCELLENCE - We deliver high-quality,…
To promote health care through supporting and/or operating, directly or through wholly-owned subsidiaries and other appropriate management arrangements, hospitals and other medically-related facilities and activities in the State of…
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."
Sharp chula vista medical center provides inpatient and outpatient medical services to the community.
Conserving nature through science and discovery.
The central mission of the university of southern california is the development of human beings and society as a whole through the cultivation and enrichment of the human mind and spirit. the principal means by which our mission is…
Mission statement: mission: caring for our patients first and our people always. vision: to be the most comprehensive, integrated and connected health system for getting and staying well. values: excellence - we deliver high-quality,…
Coronado hospital foundation is a non profit benefit corporation dedicated to enhancing the health of the community by supporting solutions to coronado's unique health care needs.
For reference, the grantee most central to the portfolio’s shape is Uc San Diego Foundation and the most unlike its peers is Resource Exchange International Inc. Resemblance is measured on each organization’s own IRS 990 mission text; it reflects how work is described, not its quality or impact.
9 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. 9 of the 13 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 Grossmont Hospital Foundation ↗
- Who funds Sharp Healthcare Foundation ↗
- Who funds NORTH AMERICAN SKULL BASE SOCIETY ↗
- Who funds SAN DIEGO AUTOMOTIVE MUSEUM ↗
- Who funds SCRIPPS HEALTH ↗
- Who funds Resource Exchange International Inc ↗
- Who funds SAN DIEGO AIR & SPACE MUSEUM INC ↗
- Who funds UC SAN DIEGO FOUNDATION ↗
- Who funds THE SPIRIT OF LIBERTY FOUNDATON ↗
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: Vanguard Charitable Endowment Program · 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 Steven Prewitt Skull Base Disease 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.
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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How do I get to Steven Prewitt Skull Base Disease Foundation?
Find your warmest path to Steven Prewitt Skull Base Disease 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.