The Jacob & Ruth Mazer Foundation
Historical FunderDenver, Colorado · EIN 13-6115875 · Private foundation
Half of its grants to organizations were between $500 and $2,800.
How to apply
The foundation filed the following application information (Form 990-PF Part XV, tax year 2025):
| Contact | MICHAEL MAZER |
|---|---|
| Address | 375 DETROIT STREET, DENVER CO 80206 |
| Phone | 7202445216 |
| Form and materials | APPLICATIONS MUST BE IN WRITING |
| Deadlines | NONE |
| Restrictions | LIMITED ONLY BY THE INTERNAL REVENUE CODE |
Copied as filed. Deadlines on a tax return describe the foundation's usual process; they are not confirmation of a current open cycle.
What it funds
Share of grant lines on the latest return, classified from the purpose each grant states.
Where it gives
90% of grants went outside Colorado.
Grants paid in tax year 2025
| Recipient | Location | Purpose | Amount |
|---|---|---|---|
| Aclu Foundation | New York, NY | General grant | $5,000 |
| Yale Alumni | New York, NY | General grant | $3,000 |
| Osborne Association | Bronx, NY | General grant | $2,800 |
| Greenwich Hospital Foundation | Cos Cob, CT | General grant | $1,000 |
| Denver Museum of Nature Science | Denver, CO | General grant | $1,000 |
| Friends of Casco Bay | Portland, ME | General grant | $1,000 |
| American Civil Liberties Union of C | Hartford, CT | General grant | $600 |
| Southern Poverty Law Center | Montgomery, AL | General grant | $500 |
| Royal River Conservation Trust | Yarmouth, ME | General grant | $500 |
| Maine Peoples Resource Center | Portland, ME | General grant | $500 |
| Ray of Hope Foundation | Mine Hill, NJ | General grant | $500 |
The return also lists 9 grants to individuals ($21,150). We do not publish the names of individual recipients.
Giving by year
| Tax year | Grants paid | Grant lines |
|---|---|---|
| 2025 | $37,550 | 20 |
| 2024 | $36,800 | 11 |
| 2023 | $25,200 | 9 |
Sources
- IRS Form 990-PF, tax year 2025, filed May 7, 2026 - IRS e-file batch, object ID 202621279349102817
- IRS Tax Exempt Organization Search for EIN 13-6115875
- Profile updated Nov 6, 2026
Facts on this page come from the foundation's own IRS Form 990-PF filings as published by the IRS. Grantvello does not know whether a foundation is accepting proposals right now: a past grant is not an open opportunity. Always confirm current guidelines with the funder before applying.