The William & Phyllis Mack Family

FORT LEE, NJ EIN: 22-3512719

The William & Phyllis Mack Family Foundation Inc is a private family foundation established in 1997 and based in Fort Lee, New Jersey. The foundation operates as a 501(c)(3) tax-exempt organization and utilizes investment income to support charitable causes across multiple sectors.

Financial Overview

From 2024 IRS Form 990-PF · View filing

Total Assets

$5.9M

+3.8% YoY

Annual Giving

$3.2M

-42.7% YoY

Grant Count

-3.6% YoY

Avg Grant Size

$61K

-40.5% YoY

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 April 2026.

Mission & Focus Areas

The foundation gives primarily to museums, as well as hospitals, education, and Jewish organizations. The foundation's grantmaking is supported by interest income, dividend income, net rental income, and gains on the sale of investments earned on its investment portfolio.

Grantmaking

The foundation makes grants for charitable purposes across its focus areas, with no specific application process information available in verified sources.

Grant Types

How to Apply

information available in verified sources.

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Geographic Focus

Where this funder awards grants

The foundation primarily funds organizations in New York, Florida, and the District of Columbia.

Grant Distribution by State

New York $11.2M (63%)

Pennsylvania $5.1M (29%)

Florida $1.3M (8%)

Connecticut $35K (0%)

California $29K (0%)

District of Columbia $5K (0%)

Oklahoma $3K (0%)

Michigan $2K (0%)

+3 more states

States

California Connecticut District of Columbia Florida Indiana Massachusetts Michigan New Jersey New York Oklahoma Pennsylvania

Cities

AventuraBethlehemBoca RatonBostonBronxBrooklynDuarteEast HamptonGreenvaleHartfordHempsteadIndianapolisIslandiaJerichoKingstonLong Island CityLos AngelesMelvilleMiami GardensNew Hyde Park

Financial History

Multi-year comparison from IRS filings

As of 2024:

Total Assets: $5,878,187
Total Revenues: $3,523,372
Total Expenses: $3,306,352
Number of Employees: 0

Revenue

Expenses

Qualifying Distributions

Net Investment Income

Metric	2024	2023	2022
Total Assets	$5,878,187	$5,661,018	$5,912,274
Revenue	$3,523,372	$5,490,738	$4,698,087
Expenses	$3,306,352	$5,750,166	$4,500,486
Qualifying Distributions	$3,213,882	$5,608,596	$4,376,780
Net Investment Income	$38,474	$50,310	$575,568
Distributable Amount	$5,254	$5,818	$9,677

Giving Over Time

Total grant dollars and number of grants per year

Grant Insights

How this funder distributes its grants

Top Recipients

Top 10 recipients in 2024

Grant Size Distribution

217 grants across all recorded years

Giving History

Grant recipients and amounts by year

Among its reported 2024 grants, the largest include Guggenheim Museum ($820,000), Northwell Health Foundation ($788,000), Uja Federation of New York ($300,000).

Recipient	Purpose	Amount
92Y NEW YORK, NY	CHARITY	$66,667
ACTA WASHINGTON, DC	CHARITY	$5,000
AFMDA NEW YORK, NY	CHARITY	$3,600
AMERICAN FRIENDS OF THE HEBREW UNIVERSITY NEW YORK, NY	CHARITY	$10,000
AMERICAN FRIENDS OF THE ISRAEL MUSEUM NEW YORK, NY	CHARITY	$130,000
AMERICAN FRIENDS OF THE ISRAEL PHIL ORCH NEW YORK, NY	CHARITY	$3,000
BEIT RUTH JERICHO, NY	CHARITY	$100,000
BIG BROTHERS BIG SISTERS OF LONG ISLAND ISLANDIA, NY	CHARITY	$100
BIRTHRIGHT ISRAEL FOUNDATION BOCA RATON, FL	CHARITY	$50,000
BRUCE AND MARSHA MOSKOWITZ FOUNDATION WEST PALM BEACH, FL	CHARITY	$25,000

Leadership & Key People

Officers and directors from IRS filings

Compensation Overview

From 2024 IRS filing

From 2024 filing

Name	Title	Hours	Compensation
WILLIAM MACK	TRUSTEE	—	—
PHYLLIS MACK	TRUSTEE	—	—
RICHARD MACK	TRUSTEE	—	—
STEPHEN MACK	TRUSTEE	—	—

Recent News & Activity

Recent developments and announcements

The Wharton School of the University of Pennsylvania received a gift from William L. and Phyllis Mack to establish the Mack Institute for Innovation Management. The Mack family has demonstrated a five-decade history of philanthropic giving that has transformed care across Manhattan and Long Island through support of health institutions.

Wharton School Announces Gift from William L. and Phyllis Mack to Establish

Subject Areas

Focus areas based on grantmaking activity

Philanthropy, Voluntarism & Grantmaking

Frequently Asked Questions

What does The William & Phyllis Mack Family fund?

How do I apply for a grant from The William & Phyllis Mack Family?

**Grant Activity & Scale:** • Made 46 grants in the most recent reporting year • Total giving: $3,213,882 • Typical award range: $100–$2,000,000 **Recent Notable Grants (2024):** • Northwell Health Foundation: $788,000 • UJA-Federation of New York: $300,000 **Grant Types:** The foundation makes grants for charitable purposes across its focus areas, with no specific application process information available in verified sources.

Where does The William & Phyllis Mack Family make grants?

The foundation primarily funds organizations in New York, Florida, and the District of Columbia.

What size grants does The William & Phyllis Mack Family award?

In 2024, The William & Phyllis Mack Family awarded 53 grants totaling $3.2M — an average of about $61K per grant, based on its IRS Form 990 filings.

How much is The William & Phyllis Mack Family required to give away each year?

Private foundations must generally distribute about 5% of their assets annually. For 2024, The William & Phyllis Mack Family reported a distributable amount of $5K on its IRS Form 990-PF — the minimum it must pay out in qualifying distributions.

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.