Gustavus and Louise Pfeiffer Research
Gustavus and Louise Pfeiffer Research is a private foundation focused on Education, based in Wilmington, DE. IRS filing data is available from 2020 through 2024. As of 2024, the organization holds $19.6M in total assets. In 2024, it awarded 3 grants totaling $651K. Net investment income was $1.7M.
Gustavus and Louise Pfeiffer Research at a glance
In short: Gustavus and Louise Pfeiffer Research gave $651K across 3 grants in 2024 (avg $217K), mostly in California. Source: 2024 IRS Form 990-PF.
- Annual giving (2024)
- $651,000
- Grants made (2024)
- 3
- Average grant
- $217,000
- Median grant
- $150,000
- Total assets
- $19,610,601
- +9.8% vs 2023
- Primary geography
- California (77% of itemized 2024 grant dollars)
- Latest 990 filing
- Form 990-PF, 2024 View filing
Data from IRS Form 990-PF, 2024; updated September 2026.
Who Gustavus and Louise Pfeiffer Research funds
How this funder distributes its grants
Top Recipients
Top 3 recipients in 2024
The largest 2024 recipient was Huntington Medical Research Institutes ($500K). Together the top 3 received $651K.
Grant Size Distribution
30 grants across all recorded years
The most common grant size was in the $100–250K range: 9 grants of 30 (30%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of 2024 grant dollars across all 3 itemized grants.
Cities
How Gustavus and Louise Pfeiffer Research gives
- Giving fell 88% from 2021 to 2024. Method
- In 2024 it paid out 87% of its IRS minimum distribution (the 5% rule). Foundations have until the end of the next year to meet it. Method
From the foundation's IRS Form 990-PF filings. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2020 to 2024, annual grant giving ranged from $651K (2024) to $5.5M (2021). In 2024 it made 3 grants totaling $651K.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Huntington Medical Research Institutes Pasadena, CA | To name the Imaging Core located in Room 332 as the "H. Robert Herold II Imaging Core" | $500,000 |
| Pfeiffer University Misenheimer, NC | Milton C. Rose Research Scholars | $150,000 |
| Old Mill Foundation San Marino, CA | General & Unrestricted | $1,000 |
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Financial History
Multi-year comparison from IRS filings
| Filing year | Total Assets | Revenue | Expenses | Grants paid | Grants | Qualifying Distributions | Net Investment Income | Distributable Amount |
|---|---|---|---|---|---|---|---|---|
| 2024 | $19,610,601 | $1,647,953 | $849,467 | $651,000 | 3 | $801,537 | $1,654,680 | $925,423 |
| 2023 | $17,863,505 | $933,643 | $188,163 | — | — | $150,344 | $926,124 | $952,813 |
| 2022 | $15,514,522 | $1,247,468 | $596,765 | $750,250 | 10 | $875,673 | $1,185,859 | $789,503 |
| 2021 | $19,275,018 | $3,508,351 | $4,671,757 | $5,450,000 | 13 | $5,568,609 | $3,497,822 | $905,193 |
| 2020 | $21,798,051 | $2,292,341 | $2,609,989 | $2,700,000 | 4 | — | $2,287,880 | $1,009,328 |
Under IRS private-foundation payout rules, Gustavus and Louise Pfeiffer Research reported a distributable amount of $925K for 2024 — the minimum it must pay out in qualifying distributions.
Leadership & Key People
Officers and directors from IRS filings
Gustavus and Louise Pfeiffer Research is led by Lise P Chapman, Director & President on every filing since 2020; all 5 officers listed in 2024 are compensated.
Officers on the 2024 filing
Lise P Chapman
Director & President
On filings since 2020
1 hr/week
$5K (2020) → $7K (2024)
Kimberly Herold Alvarez
Director
On filings since 2020
1 hr/week
$5K (2020) → $5K (2024)
Matthew Mayro Keeney
Director & Vice President
On filings since 2020
1 hr/week
$5K (2020) → $7K (2024)
Patricia R Herold
Director, As Secretary & As Treasurer
Director, Secretary & Treasurer → Director, Sec*, Treas*, As Secretary & As Treasurer, 2022
Director, Sec*, Treas*, As Secretary & As Treasurer → Director, As Secretary & As Treasurer, 2023
On filings since 2020
1 hr/week
$5K (2020) → $7K (2024)
Sarah SP McCarthy
Director, Secretary & Treasurer
Director, Assistant Secretary & Assistant Treasurer → Director, As Sec*, As Trea*, Secretary & Treasurer, 2022
Director, As Sec*, As Trea*, Secretary & Treasurer → Director, Secretary & Treasurer, 2023
On filings since 2020
1 hr/week
$5K (2020) → $7K (2024)
Former officers (2)
- Former: H Robert Herold II (2020–2023) — Director & Honorary Chair
- Former: Matthew G Herold Jr. (2020–2021) — Director & Honorary Chair
Data from IRS Form 990 filings, 2020–2024. "On filings since" is the earliest filing we hold that lists the person; hours are average hours per week as reported.
Compensation Overview
From 2024 IRS filing
The highest reported compensation on the 2024 filing was $7K, to Lise P Chapman (Dir, Pres). 5 officers or directors reported compensation on that filing.
Frequently asked questions about Gustavus and Louise Pfeiffer Research
How much does Gustavus and Louise Pfeiffer Research give each year?
Gustavus and Louise Pfeiffer Research gave $651K across 3 grants in 2024, according to its 2024 IRS Form 990-PF.
What is Gustavus and Louise Pfeiffer Research's typical grant size?
Gustavus and Louise Pfeiffer Research's median grant in 2024 was $150,000, and its average grant was $217,000, across 3 grants on its 2024 IRS Form 990-PF.
Where does Gustavus and Louise Pfeiffer Research give grants?
Gustavus and Louise Pfeiffer Research gives mostly in California: 77% of the grant dollars itemized on its 2024 IRS Form 990-PF went to recipients there. The next largest state was North Carolina (23%).
Does Gustavus and Louise Pfeiffer Research give general operating support?
Yes: 33% of Gustavus and Louise Pfeiffer Research's 2024 grants with a stated purpose (1 of 3) were for general or operating support, per its 2024 IRS Form 990-PF.
How large is Gustavus and Louise Pfeiffer Research?
Gustavus and Louise Pfeiffer Research reported $19.6M in total assets on its 2024 IRS Form 990-PF. It paid out $802K in qualifying distributions that year, against a required minimum of $925K (roughly 5% of its investment assets). Falling short in one year is not a violation: foundations have until the end of the next year to meet the minimum.
What is Gustavus and Louise Pfeiffer Research?
Gustavus and Louise Pfeiffer Research is a private foundation focused on Education, based in Wilmington, DE. It holds $19.6M in total assets as of 2024.
What is Gustavus and Louise Pfeiffer Research's EIN?
Gustavus and Louise Pfeiffer Research's EIN (Employer Identification Number) is 13-6086299. IRS Form 990 filing data is available on this page for 2020–2024.
Data last updated September 2026. Sourced from IRS Form 990-PF filings.
Data update history
(1)
When this profile's IRS filing data changed on Grantable
- IRS filings on file for fiscal years 2020–2024
Live grants for the work Gustavus and Louise Pfeiffer Research funds
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