The William & Phyllis Mack Family Foundation concentrates large gifts to major cultural, higher‑education and regional healthcare institutions in the Northeast. Their giving is focused and institutional—multi‑million dollar, repeat grants to a small set of anchor organizations (notably the University of Pennsylvania, the Solomon R. Guggenheim Museum, and Northwell Health). The foundation appears to prioritize sustaining flagship cultural and civic institutions rather than many small community programs.
The William & Phyllis Mack Family Foundation Inc. gives at a level that supports major institutions rather than small projects, with repeated six- and seven-figure grants to a narrow set of anchors. University of Pennsylvania received $2,000,000 in both 2023 and 2024, showing a multi-year commitment to a single university. The Guggenheim Museum also appears repeatedly, including $670,000 in 2023, $920,000 in 2024, and $820,000 in 2025, placing major art museums at the center of the foundation’s portfolio. Northwell Health Foundation is another recurring beneficiary, with grants of $700,250 in 2023, $783,000 in 2024, and $788,000 in 2025. These patterns point to institutional support for higher education, cultural organizations, and regional healthcare systems. The funder’s recent grant record also includes Jewish communal organizations and related cultural institutions, but the dominant feature is concentration: a relatively small set of recipients receives substantial support across multiple years. That makes the foundation particularly legible as an anchor funder for established organizations with ongoing operating or capital needs.
Higher education is a major part of the portfolio. The foundation gave $2,000,000 to the University of Pennsylvania in 2023 and another $2,000,000 in 2024. Cultural philanthropy is similarly prominent: the Guggenheim Museum received $670,000 in 2023, $920,000 in 2024, and $820,000 in 2025. In Jewish communal support, Uja Federation of New York received $400,000 in 2024 and $300,000 in 2025, while Park Avenue Synagogue received $243,213 in 2023, $110,768 in 2024, and $109,848 in 2025. Healthcare also appears through Northwell Health Foundation, which received $700,250 in 2023, $783,000 in 2024, and $788,000 in 2025.
Grant sizes are clustered around larger institutional awards, with a p25 of $1,000, a median of $5,000, and a p75 of $30,000. The recent grant list shows repeated support for the same organizations across 2023, 2024, and 2025, including multiple-year gifts to universities, museums, health systems, and Jewish communal institutions. The foundation does not fund individuals and does not make program-related investments. The pattern is one of recurring, institution-level support rather than a one-time or application-driven small-grant program.
$3.2M
$5.9M
$3.5M
$3.3M
Most grants fall between $1K and $30K, with a median of $5K.
25th Percentile
$1K
Median
$5K
75th Percentile
$30K
About 1% of grants go to recipients in NY.
Top 2 recipient countries by grant volume for William & Phyllis Mack Family Foundation.
| Rank | Country | Grants | Total | Share |
|---|---|---|---|---|
| 1 | United StatesDomestic | 153 | $13.2M | 99.3% |
| 2 | United Kingdom |
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Highly concentrated: few very large grants, multiple repeat gifts to the same institutional grantees, preference for flagship cultural, higher‑education and healthcare organizations rather than broad, small-dollar giving.
Notable grantees: University of Pennsylvania, Guggenheim Museum, Northwell Health Foundation
Most grants go to recipients in the United States, with one grant listed in the United Kingdom. New York is the top state by grant count, and many recipients are in New York City or nearby: Guggenheim Museum and The Jewish Museum in New York, Park Avenue Synagogue in New York, Northwell Health Foundation in New Hyde Park, and 92y in New York. Outside New York, Philadelphia appears through the University of Pennsylvania, and West Palm Beach through Jewish Federation of Palm Beach and the Kravis Center for the Performing Arts. New Jersey recipients account for 1% of grants.
Its recent grants go mainly to major cultural institutions, elite higher education, regional healthcare, and Jewish communal organizations. Examples include the Guggenheim Museum, the University of Pennsylvania, Northwell Health Foundation, Uja Federation of New York, and Park Avenue Synagogue.
Yes. Several recipients appear across multiple years, including the University of Pennsylvania at $2,000,000 in both 2023 and 2024, the Guggenheim Museum in 2023, 2024, and 2025, and Northwell Health Foundation in 2023, 2024, and 2025.
The distribution shows a p25 of $1,000, a median of $5,000, and a p75 of $30,000. The recent grant list also includes much larger institutional gifts, including seven-figure awards to universities and six-figure awards to museums, federations, synagogues, and healthcare organizations.
Most grants go to recipients in the United States, with New York as the top state by grant count. Recent recipient cities include Philadelphia, New York, New Hyde Park, West Palm Beach, Palm Beach, Brooklyn, and Jericho.
No. The foundation funds charities rather than individuals, and it does not make program-related investments.
2025
Source: IRS Form 990-PF, fiscal year 2025.
| 1 |
| $1K |
0.7% |
Recipient country reflects the grantee's headquarters per IRS 990-PF and Schedule F filings, not the program's implementation country.
Most recent grants reported to the IRS.
| Recipient | Location | Amount | Year | Purpose |
|---|---|---|---|---|
| GUGGENHEIM MUSEUM | NEW YORK, NY | $820,000 | 2025 | CHARITY |
| NORTHWELL HEALTH FOUNDATION | NEW HYDE PARK, NY | $788,000 | 2025 | CHARITY |
| UJA FEDERATION OF NEW YORK | NEW YORK, NY | $300,000 | 2025 | CHARITY |
| JEWISH FEDERATION OF PALM BEACH | WEST PALM BEACH, FL | $151,000 | 2025 | CHARITY |
| AMERICAN FRIENDS OF THE ISRAEL MUSEUM | NEW YORK, NY | $130,000 | 2025 | CHARITY |
| PARK AVENUE SYNAGOGUE | NEW YORK, NY | $109,848 | 2025 | CHARITY |
| KRAVIS CENTER FOR THE PERFORMING ARTS | WEST PALM BEACH, FL | $100,000 | 2025 | CHARITY |
| BEIT RUTH | JERICHO, NY | $100,000 | 2025 | CHARITY |
| THE JEWISH MUSEUM | NEW YORK, NY | $95,000 | 2025 | CHARITY |
| 92Y | NEW YORK, NY | $66,667 | 2025 | CHARITY |
| MORSELIFE FOUNDATION INC | WEST PALM BEACH, FL | $50,000 | 2025 | CHARITY |
| TARGET ALS FOUNDATION INC | NEW YORK, NY | $50,000 | 2025 | CHARITY |
| BIRTHRIGHT ISRAEL FOUNDATION | BOCA RATON, FL | $50,000 | 2025 | CHARITY |
| THE NEW JEWISH HOME | NEW YORK, NY | $50,000 | 2025 | CHARITY |
| YESHIVA UNIVERSITY | NEW YORK, NY | $50,000 | 2025 | CHARITY |
| THE SOCIETY OF THE FOUR ARTS | PALM BEACH, FL | $29,000 | 2025 | CHARITY |
| NORTON MUSEUM OF ART | WEST PALM BEACH, FL | $26,250 | 2025 | CHARITY |
| CONNECTICUT PUBLIC BROADCASTING | HARTFORD, CT | $25,000 | 2025 | CHARITY |
| BRUCE AND MARSHA MOSKOWITZ FOUNDATION | WEST PALM BEACH, FL | $25,000 | 2025 | CHARITY |
| MECOX BAY CONSERVANCY | WATERMILL, NY | $25,000 | 2025 | CHARITY |
| TOWN OF PALM BEACH UNITED WAY | PALM BEACH, FL | $25,000 | 2025 | CHARITY |
| GIFT OF LIFE MARROW REGISTRY | BOCA RATON, FL | $25,000 | 2025 | CHARITY |
| THE WHARTON FUND | PHILADELPHIA, PA | $25,000 | 2025 | CHARITY |
| ISRAEL TENNIS & EDUCATION CENTERS FOUNDATION | NEW YORK, NY | $10,000 | 2025 | CHARITY |
| PALM BEACH SYNAGOGUE | PALM BEACH, FL | $10,000 | 2025 | CHARITY |
| AMERICAN FRIENDS OF THE HEBREW UNIVERSITY | NEW YORK, NY | $10,000 | 2025 | CHARITY |
| THE MILKKEN INSTITUTE | NEW YORK, NY | $6,867 | 2025 | CHARITY |
| THE MUSEUM OF MODERN ART | NEW YORK, NY | $6,000 | 2025 | CHARITY |
| FEDERAL ENFORCEMENT HOMELAND SECURITY FDN | NEW YORK, NY | $5,000 | 2025 | CHARITY |
| PALM BEACH CIVIC ASSOCIATION | PALM BEACH, FL | $5,000 | 2025 | CHARITY |
| MOUNT SINAI HEALTH SYSTEM CRYSTAL PARTY | NEW YORK, NY | $5,000 | 2025 | CHARITY |
| SOLOMON INSTITUTE INC | PALM BEACH, FL | $5,000 | 2025 | CHARITY |
| DELIVERING GOOD | NEW YORK, NY | $5,000 | 2025 | CHARITY |
| ACTA | WASHINGTON, DC | $5,000 | 2025 | CHARITY |
| AFMDA | NEW YORK, NY | $3,600 | 2025 | CHARITY |
| AMERICAN FRIENDS OF THE ISRAEL PHIL ORCH | NEW YORK, NY | $3,000 | 2025 | CHARITY |
| PROMISE FUND OF FLORIDA | PALM BEACH, FL | $2,500 | 2025 | CHARITY |
| PECONIC LAND TRUST | SOUTHHAMPTON, NY | $2,500 | 2025 | CHARITY |
| UNITED STATES HOLOCAUST MEMORIAL MUSEUM | WASHINGTON, DC | $2,500 | 2025 | CHARITY |
| PLANNED PARENTHOOD | HEMPSTEAD, NY | $2,500 | 2025 | CHARITY |
| THE MICHAEL J FOX FOUNDATION | NEW YORK, NY | $1,250 | 2025 | CHARITY |
| FRIENDS OF THE ISRAEL DEFENSE FORCES | BROOKLYN, NY | $1,000 | 2025 | CHARITY |
| DOLPHINS CHALLENGE CANCER | MIAMI GARDENS, FL | $1,000 | 2025 | CHARITY |
| NEW YORK HISTORICAL SOCIETY | NEW YORK, NY | $1,000 | 2025 | CHARITY |
| HOW | TULSA, OK | $750 | 2025 | CHARITY |
| BREAST CANCER RESEARCH FOUNDATION | NEW YORK, NY | $550 | 2025 | CHARITY |
| SBT CLUB CHARITABLE FUND | SOUTHHAMPTON, NY | $500 | 2025 | CHARITY |
| THE LUSTGARTEN FOUNDATION | WOODBURY, NY | $500 | 2025 | CHARITY |
| DANA-FARBER CANCER INSTITUTE | BOSTON, MA | $500 | 2025 | CHARITY |
| THE RESOURCE FOUNDATION | NEW YORK, NY | $500 | 2025 | CHARITY |
GUGGENHEIM MUSEUM
$820,000CHARITY
NORTHWELL HEALTH FOUNDATION
$788,000CHARITY
PARK AVENUE SYNAGOGUE
CHARITY
KRAVIS CENTER FOR THE PERFORMING ARTS
$100,000CHARITY
BEIT RUTH
$100,000CHARITY
92Y
$66,667CHARITY
TARGET ALS FOUNDATION INC
$50,000CHARITY
BIRTHRIGHT ISRAEL FOUNDATION
$50,000CHARITY
THE NEW JEWISH HOME
$50,000CHARITY
MECOX BAY CONSERVANCY
$25,000CHARITY
THE WHARTON FUND
$25,000CHARITY
PALM BEACH SYNAGOGUE
$10,000CHARITY
AMERICAN FRIENDS OF THE HEBREW UNIVERSITY
$10,000CHARITY
FEDERAL ENFORCEMENT HOMELAND SECURITY FDN
$5,000CHARITY
MOUNT SINAI HEALTH SYSTEM CRYSTAL PARTY
$5,000CHARITY
SOLOMON INSTITUTE INC
$5,000CHARITY
AMERICAN FRIENDS OF THE ISRAEL PHIL ORCH
$3,000CHARITY
PROMISE FUND OF FLORIDA
$2,500CHARITY
PLANNED PARENTHOOD
$2,500CHARITY
NEW YORK HISTORICAL SOCIETY
$1,000CHARITY
HOW
$750CHARITY
SBT CLUB CHARITABLE FUND
$500CHARITY
THE RESOURCE FOUNDATION
$500CHARITY