The William B Wiener Jr Foundation
Type I supporting organization to rockefeller family fund, inc. A public charity whose mission is to initiate, cultivate, and fund strategic efforts to promote a sustainable, just, free, and participatory society.
The William B Wiener Jr Foundation at a glance
In short: The William B Wiener Jr Foundation gave $1.1M across 1 grant in 2024 (avg $1.1M), mostly in New York. Source: 2024 IRS Form 990.
- Annual giving (2024)
- $1,100,000
- -97.9% vs 2023
- Grants made (2024)
- 1
- +0.0% vs 2023
- Average grant
- $1,100,000
- -97.9% vs 2023
- Median grant
- $1,100,000
- Total assets
- $4,605,672
- -22.7% vs 2023
- Primary geography
- New York (100% of itemized 2024 grant dollars)
- Latest 990 filing
- Form 990, 2024 View filing
Data from IRS Form 990, 2024; updated September 2026.
Who The William B Wiener Jr Foundation funds
How this funder distributes its grants
Top Recipients
Top recipient in 2024
The largest 2024 recipient was Rockefeller Family Fund Inc ($1.1M).
Grant Size Distribution
6 grants across all recorded years
The most common grant size was in the $1–5M range: 3 grants of 6 (50%).
Geographic Focus
Where this funder awards grants
Grant Distribution by State
Share of the 2024 grant dollars on its one itemized grant.
States
Cities
How The William B Wiener Jr Foundation gives
- Giving fell 91% from 2021 to 2024. Method
From the foundation's IRS Form 990 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 $1.1M (2024) to $53.1M (2023). In 2024 it made 1 grant totaling $1.1M.
Grants by year
Grant recipients and amounts by year
| Recipient | Purpose | Amount |
|---|---|---|
| Rockefeller Family Fund Inc New York, NY | Support for rff programs: environment, democracy, and other charitable purposes | $1,100,000 |
Ready to take the next step with The William B Wiener Jr Foundation?
Financial History
Multi-year comparison from IRS filings
| Filing year | Total Assets | Revenue | Expenses | Grants paid | Grants | Net Investment Income |
|---|---|---|---|---|---|---|
| 2024 | $4,605,672 | $657,921 | $1,425,085 | $1,100,000 | 1 | $657,921 |
| 2023 | $5,961,828 | $30,454,265 | $53,687,881 | $53,116,073 | 1 | $30,454,265 |
| 2022 | $43,300,325 | $2,963,352 | $2,084,275 | $1,730,000 | 1 | $2,963,352 |
| 2021 | $23,196,478 | $3,677,470 | $13,070,031 | $12,511,968 | 2 | $2,106,851 |
| 2020 | $32,505,054 | $926,275 | $2,079,071 | $1,555,000 | 1 | $465,730 |
About The William B Wiener Jr Foundation
Based on IRS filings
The William B Wiener Jr Foundation is a public charity, based in Shreveport, LA. IRS filing data is available from 2020 through 2024. As of 2024, the organization holds $4.6M in total assets. In 2024, it awarded 1 grant totaling $1.1M. Net investment income was $658K.
Leadership & Key People
Officers and directors from IRS filings
The William B Wiener Jr Foundation is led by Donald B. Wiener, President & Assistant Treasurer since 2022 (on filings since 2020); none of the 6 officers listed in 2024 report compensation.
Officers on the 2024 filing
Donald B. Wiener
President & Assistant Treasurer
Director, President & Assistant Treasurer → President & Assistant Treasurer, 2022
On filings since 2020
2 hrs/week
No compensation reported
Elizabeth Mayo
Executive Director
On filings since 2020
10 hrs/week
No compensation reported
David Rockefeller Jr.
Vice President
Director → Vice President, 2022
On filings since 2020
2 hrs/week
No compensation reported
Jay R. Halfon
Treasurer & Assistant Secretary
Director & Assistant Secretary → Treasurer & Assistant Secretary, 2022
On filings since 2020
2 hrs/week
No compensation reported
Jeffrey W. Weiss
Secretary
Director, Treasurer & Secretary → Secretary, 2022
On filings since 2020
2 hrs/week
No compensation reported
Miranda Kaiser
Vice President
Director & Vice President → Vice President, 2022
On filings since 2021
2 hrs/week
No compensation reported
Former officers (2)
- Former: William B. Wiener Jr. (2020–2023) — Vice President & Assistant Treasurer
- Former: David Kaiser (2020) — Director & Vice President
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 B Wiener Jr Foundation
How much does The William B Wiener Jr Foundation give each year?
The William B Wiener Jr Foundation gave $1.1M across 1 grant in 2024, according to its 2024 IRS Form 990. In 2023 it gave $53.1M across 1 grant.
How large is The William B Wiener Jr Foundation?
The William B Wiener Jr Foundation reported $4.6M in total assets on its 2024 IRS Form 990. Its revenue that year was $658K.
Where does The William B Wiener Jr Foundation operate?
The William B Wiener Jr Foundation has awarded grants in New York.
What is The William B Wiener Jr Foundation's EIN?
The William B Wiener Jr Foundation's EIN (Employer Identification Number) is 72-6024398. IRS Form 990 filing data is available on this page for 2020–2024.
Data last updated September 2026. Sourced from IRS Form 990 filings.
Data update history
(6)
When this profile's IRS filing data changed on Grantable
- Updated Form 990 for fiscal year 2020 (received by the IRS November 15, 2021)
- Updated Form 990 for fiscal year 2021 (received by the IRS November 11, 2022)
- Updated Form 990 for fiscal year 2022 (received by the IRS November 13, 2023)
- Updated Form 990 for fiscal year 2023 (received by the IRS November 9, 2024)
- Updated Form 990 for fiscal year 2024 (received by the IRS November 13, 2025)
- IRS filings on file for fiscal years 2020–2024
Other open foundation grants in Louisiana
Louisiana Open opportunities, soonest deadline first.
Explore Open Grants
Browse active grant opportunities in The William B Wiener Jr Foundation's focus areas in our free grants database
Similar Funders
Funders with grantees in common
Freedom Together Foundation
New York, NY
The foundation funds work to strengthen multiracial democracy and build community and worker power, racial and gender justice, movement infrastructure, reproductive health, medical research, and community institutions. In 2024, its grants ranged from $5,000 to $14 million, with a median of $500,000; its largest shares went to organizations in Washington, DC, New York, California, Massachusetts, and Illinois. It funds only preselected organizations and does not accept unsolicited requests.
Assets
$3.4B
Grants
595
Total Given
$470.0M
Rockefeller Brothers Fund Inc
New York, NY
The Rockefeller Brothers Fund supports work on democracy, sustainable development and climate, and peacebuilding, as well as place-based efforts in China, Central America, and the Western Balkans and arts and culture in New York City. Its 2024 grants had a median of $60,000, though awards varied widely. It accepts unsolicited requests, but rarely funds them—fewer than 1 percent result in funding.
Assets
$1.4B
Grants
646
Total Given
$60.4M
Environment Now
Newport Beach, CA
Environment Now supports effective programs protecting and restoring California’s waters and forests, including work on water, forests, climate, and environmental rights. In 2024, grants ranged from $500 to $175,000, with a median of $20,000; its work focuses on California, though it also funded organizations in other states. It funds only preselected organizations and does not accept unsolicited requests.
Assets
$32.5M
Grants
61
Total Given
$1.5M
The Zegar Family Foundation
New York, NY
The Zegar Family Foundation supports environment and sustainability, justice and human rights, science, education, and community development, with most 2024 funding going to organizations in New York, California, and Washington, D.C. Its 105 grants in 2024 ranged from $10,000 to about $3.23 million, with a median of $125,000. It does not accept unsolicited requests; proposals are by invitation only.
Assets
$297.7M
Grants
105
Total Given
$27.0M
Climate Imperative Foundation
San Francisco, CA
Climate Imperative Foundation funds organizations advancing science- and policy-based reductions in carbon emissions, including clean energy, electrification, and cutting industrial pollution. Its 2024 grants ranged from $75,000 to $29.75 million, with a median of $500,000, supporting work in major-emitting countries and regions; most reported grant dollars went to California, D.C., and New York. It does not accept unsolicited requests.
Assets
$109.6M
Grants
96
Total Given
$161.5M
WK Kellogg Foundation
Battle Creek, MI
The W.K. Kellogg Foundation funds work to help children, families, and communities thrive, including early education, health equity, food systems, family economic well-being, and racial equity. In 2025, its grants ranged from $50 to nearly $5 million, with a median of $100,000; it funds across the United States, with long-term commitments in several states and communities, as well as parts of Mexico and Haiti. It accepts unsolicited proposals online at any time.
Assets
$481.0M
Grants
1,818
Total Given
$303.9M
More similar funders
More Funders in Louisiana
The filing figures on this page are open data under CC BY 4.0. About GrantGraph Open
Figures come from The William B Wiener Jr Foundation'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.
The William B Wiener Jr Foundation down — hundreds of funders to go?