The William & Phyllis Mack Family
The William & Phyllis Mack Family is a private foundation based in Fort Lee, New Jersey. In 2024, it reported 53 grants totaling $3,213,882 to charitable organizations, including museums, health-related organizations, Jewish organizations, and cultural institutions.
The William & Phyllis Mack Family at a glance
In short: The William & Phyllis Mack Family gave $3.2M across 53 grants in 2024 (avg $61K), mostly in New York. 32% of 2024 grantees were new. Source: 2024 IRS Form 990-PF.
- Annual giving (2024)
- $3,213,882
- -42.7% vs 2023
- Grants made (2024)
- 53
- -3.6% vs 2023
- Average grant
- $60,639
- -40.5% vs 2023
- Median grant
- $6,867
- Total assets
- $5,878,187
- +3.8% vs 2023
- New grantees (estimate)
- 32% first-time grantees (17 of 53, 2024)
- Primary geography
- New York (82% of itemized 2024 grant dollars)
- Latest 990 filing
- Form 990-PF, 2024 View filing
Data from IRS Form 990-PF, 2024; updated October 2026. New grantees are estimated by matching recipient names across years (methodology).
How to apply to The William & Phyllis Mack Family
- Accepts unsolicited proposals
- No
- How to Apply
-
The foundation makes contributions only to preselected charitable organizations and does not accept unsolicited requests for funds.
- Contact
Mailing address: One Bridge Plaza 660, Fort Lee, NJ 07024
Phone: (201) 346-5400
Application details from Grantable's research on the foundation's public materials; confirm on its website before applying.
Who The William & Phyllis Mack Family funds
How this funder distributes its grants
Top Recipients
Top 10 recipients in 2024
The largest 2024 recipient was Guggenheim Museum ($820K). Together the top 10 received $2.7M.
Grant Size Distribution
225 grants across all recorded years
The most common grant size was under $50K: 172 grants of 225 (76%).
Geographic Focus
Where this funder awards grants
In 2024, 82% of grant dollars went to recipients in New York and 16% to recipients in Florida. Connecticut and Pennsylvania each received 1%; the share for the District of Columbia was 0%.
Grant Distribution by State
Share of 2024 grant dollars across all 53 itemized grants.
States
Cities
Is The William & Phyllis Mack Family open to new grantees?
32%
first-time grantees, 2024
In 2024, 17 of 53 grantees (32%) were first-time recipients. First grants averaged $13K; repeat grants $83K. How we count
Medians: $5K first-time, $25K repeat.
- 60% of 2024 grantees were also funded in 2023. Method
- Giving fell 26% from 2021 to 2024. Method
- In 2024 it paid out well above its IRS minimum distribution (the 5% rule). Method
Estimate from itemized grant lists in IRS Form 990-PF filings (2020–2024). Recipient names are matched across years, so a renamed or misspelled grantee can look new; grants to individuals are left out. Methodology.
Giving History
Giving Over Time
Total grant dollars and number of grants per year
From 2020 to 2024, annual grant giving ranged from $3.2M (2020) to $5.6M (2023). In 2024 it made 53 grants totaling $3.2M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Guggenheim Museum New York, NY | Charity | $820,000 |
| Northwell Health Foundation New Hyde Park, NY | Charity | $788,000 |
| UJA Federation of New York New York, NY | Charity | $300,000 |
| Jewish Federation of Palm Beach West Palm Beach, FL | Charity | $151,000 |
| American Friends of the Israel Museum New York, NY | Charity | $130,000 |
| Park Avenue Synagogue New York, NY | Charity | $109,848 |
| Beit Ruth Jericho, NY | Charity | $100,000 |
| Kravis Center for the Performing Arts West Palm Beach, FL | Charity | $100,000 |
| The Jewish Museum New York, NY | Charity | $95,000 |
| 92Y New York, NY | Charity | $66,667 |
Ready to take the next step with The William & Phyllis Mack Family?
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 | $5,878,187 | $3,523,372 | $3,306,352 | $3,213,882 | 53 | $3,213,882 | $38,474 | $5,254 |
| 2023 | $5,661,018 | $5,490,738 | $5,750,166 | $5,608,596 | 55 | $5,608,596 | $50,310 | $5,818 |
| 2022 | $5,912,274 | $4,698,087 | $4,500,486 | $4,376,780 | 46 | $4,376,780 | $575,568 | $9,677 |
| 2021 | $6,899,137 | $5,510,037 | $4,448,507 | $4,314,890 | 35 | $4,314,890 | $289,596 | $70,391 |
| 2020 | $4,663,566 | $2,789,264 | $3,222,821 | $3,194,415 | 36 | — | $404,569 | $16,448 |
Under IRS private-foundation payout rules, The William & Phyllis Mack Family reported a distributable amount of $5K for 2024 — the minimum it must pay out in qualifying distributions.
Research compiled by Grantable AI from public sources. Last updated September 2026.
Mission & Focus Areas
No mission statement for the foundation is provided. Its 2024 grants went to organizations with varied purposes. For example, Northwell Health Foundation describes its work as helping fund support for underserved and uninsured people, medical technology and research, and facilities and programs within Northwell Health. The Jewish Museum describes its mission as collecting, preserving, exhibiting, and interpreting art and Jewish culture.
Other 2024 recipients describe work in areas including senior living in the spirit of Jewish tradition (MorseLife Foundation), ALS research (Target ALS Foundation), education and research (Yeshiva University), and arts and cultural programming (The Society of the Four Arts and Norton Museum of Art).
Grantmaking
In 2024, the foundation reported 53 grants totaling $3,213,882. Grant amounts ranged from $100 to $820,000, with a median grant of $6,867.
Among the largest 2024 grants were $820,000 to the Guggenheim Museum, $788,000 to Northwell Health Foundation, $300,000 to UJA Federation of New York, $151,000 to Jewish Federation of Palm Beach, and $130,000 to American Friends of the Israel Museum. Other grants included $109,848 to Park Avenue Synagogue, $100,000 each to Beit Ruth and Kravis Center for the Performing Arts, and $95,000 to The Jewish Museum.
Leadership & Key People
Leadership team and compensation from IRS filings
The 2024 filing lists William Mack, Phyllis Mack, Richard Mack, and Stephen Mack as trustees.
The William & Phyllis Mack Family's 2024 filing lists 4 officers; none of the 4 officers listed in 2024 report compensation.
Officers on the 2024 filing
Phyllis Mack
Trustee
On filings since 2020
No compensation reported
Richard Mack
Trustee
On filings since 2020
No compensation reported
Stephen Mack
Trustee
On filings since 2020
No compensation reported
William Mack
Trustee
On filings since 2020
No compensation reported
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.
Frequently asked questions about The William & Phyllis Mack Family
How much does The William & Phyllis Mack Family give each year?
The William & Phyllis Mack Family gave $3.2M across 53 grants in 2024, according to its 2024 IRS Form 990-PF. In 2023 it gave $5.6M across 55 grants.
What is The William & Phyllis Mack Family's typical grant size?
The William & Phyllis Mack Family's median grant in 2024 was $6,867, and its average grant was $60,639, across 53 grants on its 2024 IRS Form 990-PF. Organizations receiving their first grant from The William & Phyllis Mack Family that year got $13K on average.
Where does The William & Phyllis Mack Family give grants?
The William & Phyllis Mack Family gives mostly in New York: 82% of the grant dollars itemized on its 2024 IRS Form 990-PF went to recipients there. The next largest state was Florida (16%). The most frequent recipient cities were New York, NY (23 grants), West Palm Beach, FL (6 grants), Palm Beach, FL (6 grants) and Boca Raton, FL (2 grants).
Does The William & Phyllis Mack Family give general operating support?
Not in 2024: none of the 53 grants with a stated purpose on The William & Phyllis Mack Family's 2024 IRS Form 990-PF were described as general or operating support. Recurring purposes include "Charity" (53 grants).
Who are The William & Phyllis Mack Family's largest grantees?
The William & Phyllis Mack Family's largest 2024 grantees include Guggenheim Museum ($820,000), Northwell Health Foundation ($788,000) and UJA Federation of New York ($300,000), according to its 2024 IRS Form 990-PF. Together they received 59% of its itemized 2024 grant dollars.
How large is The William & Phyllis Mack Family?
The William & Phyllis Mack Family reported $5.9M in total assets on its 2024 IRS Form 990-PF. It paid out $3.2M in qualifying distributions that year, against a required minimum of $5K (roughly 5% of its investment assets).
What does The William & Phyllis Mack Family fund?
No mission statement for the foundation is provided. Its 2024 grants went to organizations with varied purposes. See mission & focus areas ↑
How do I apply for a grant from The William & Phyllis Mack Family?
The foundation makes contributions only to preselected charitable organizations and does not accept unsolicited requests for funds. Eligibility and process details are in the grantmaking section of this profile. See how to apply ↑
What is The William & Phyllis Mack Family's EIN?
The William & Phyllis Mack Family's EIN (Employer Identification Number) is 22-3512719. IRS Form 990 filing data is available on this page for 2020–2024.
Does The William & Phyllis Mack Family accept unsolicited proposals?
No, according to Grantable's research on the foundation's published guidelines. See how to apply ↑
Data last updated October 2026. Sourced from IRS Form 990-PF filings. Research dossier generated September 2026.
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 The William & Phyllis Mack Family funds
Philanthropy, Voluntarism & Grantmaking Open opportunities, soonest deadline first.
- Nixa Affiliate Grantmaking Program Up to US $10,000 · Due October 19, 2026
- Community and School Grants $28,000 total pool; 10-15 grants expected · Due October 19, 2026
- Mary Pinola/Crescenta Valley Chamber Education Fund $500 - $5,000 for ongoing programs; up to $15,000 for Strategic Initiative Grants · Due October 19, 2026
Explore Open Grants
Browse active grant opportunities in The William & Phyllis Mack Family's focus areas in our free grants database
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Cite this profile
Grantable. (2026). The William & Phyllis Mack Family funder profile. GrantGraph. Retrieved October 19, 2026, from https://grantable.co/funders/the-william-and-phyllis-mack-family-morg_3d24a6eea09d435cb18cf2dab4033d45
BibTeX
@misc{grantable_223512719_2026,
author = {{Grantable}},
title = {{The William \& Phyllis Mack Family funder profile}},
howpublished = {GrantGraph},
year = {2026},
url = {https://grantable.co/funders/the-william-and-phyllis-mack-family-morg_3d24a6eea09d435cb18cf2dab4033d45},
note = {Accessed 2026-10-19. Data licensed CC BY 4.0}
}The figures on this page are open data under CC BY 4.0: reuse them with credit to Grantable and a link. Download the data.
Figures come from The William & Phyllis Mack Family's IRS filings (methodology). AI-written summaries, news items and logos are not covered by the open licence. Spot an error? Email hello@grantable.co.
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