The Jacob & Ruth Mazer Foundation
Accepts applications
The Jacob & Ruth Mazer Foundation is a private foundation in Denver, Colorado. In tax year 2025 it gave $37,550 in 20 grants; the typical grant was $1,000 and the largest $8,500. It accepts applications; its filing gives the instructions below.
From its IRS Form 990-PF for tax year 2025.
- Grants paid, 2025$37,550
- Number of grants20
- Typical grant$1,000
- Largest grant$8,500
- Assets$663,966
- New grantees77%
Giving in 2025 was up from $36,800 the year before.
77% of its 2025 grantees had not received a grant from it the year before, a sign it is open to new organizations.
Giving by year
| Tax year | Grants paid | Number of grants | Assets |
|---|---|---|---|
| 2023 | $25,200 | 9 | $536,340 |
| 2024 | $36,800 | 11 | $596,081 |
| 2025 | $37,550 | 20 | $663,966 |
How to apply
| Contact | Michael Mazer 375 Detroit Street, Denver, CO 80206 |
|---|---|
| Phone or email | (720) 244-5216 |
| What to submit | Applications must be in writing |
| Restrictions | Limited only by the internal revenue code |
What The Jacob & Ruth Mazer Foundation funds
Where it gives
Its grants went to recipients in 9 states, the most to New York.
| State | Grants | Amount |
|---|---|---|
| New York | 4 | $19,300 |
| Colorado | 3 | $8,750 |
| Maine | 6 | $4,400 |
| Connecticut | 2 | $1,600 |
| California | 1 | $1,500 |
| Alabama | 1 | $500 |
| Massachusetts | 1 | $500 |
| New Jersey | 1 | $500 |
| Wisconsin | 1 | $500 |
Grants paid in 2025
| Recipient | Purpose | Amount |
|---|---|---|
| Individual | General grant | $8,500 |
| Individual | General grant | $5,000 |
| ACLU Foundation | General grant | $5,000 |
| Individual | General grant | $3,000 |
| Osborne Association | General grant | $2,800 |
| Individual | General grant | $2,750 |
| Camp Kesem | General grant | $1,500 |
| Greenwich Hospital Foundation | General grant | $1,000 |
| Denver Museum of Nature Science | General grant | $1,000 |
| Friends of Casco Bay | General grant | $1,000 |
| ACLU of Maine | General grant | $1,000 |
| Individual | General grant | $700 |
| Individual | General grant | $700 |
| American Civil Liberties Union of C | General grant | $600 |
| Southern Poverty Law Center | General grant | $500 |
| Individual | General grant | $500 |
| FFRF | General grant | $500 |
| Royal River Conservation Trust | General grant | $500 |
| Maine Peoples Resource Center | General grant | $500 |
| Ray of Hope Foundation | General grant | $500 |
Officers and trustees
- Michael Mazer
- Harriet Mazer
Questions people ask
Does The Jacob & Ruth Mazer Foundation accept grant applications?
Yes. Its latest IRS filing says it accepts applications.
How much does The Jacob & Ruth Mazer Foundation give?
$37,550 in tax year 2025, across 20 grants, with a typical grant of $1,000.
Who runs The Jacob & Ruth Mazer Foundation?
Its 2025 filing lists Michael Mazer (President) and Harriet Mazer (Treasurer).
What does The Jacob & Ruth Mazer Foundation fund?
Based on its grants, mainly environment and conservation.