Nonprofit · EIN 94-2427732
MARIN HORIZON SCHOOL INCORPORATED
Tax-exempt · MILL VALLEY, CA 94941
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| June 30, 2025 | 990 | $16,842,162 | $14,532,644 | $2,309,518 | $49,507,150 | $26,810,511 | $22,696,639 |
| June 30, 2024 | 990 | $16,229,609 | $13,870,477 | $2,359,132 | $46,353,722 | $26,460,471 | $19,893,251 |
| June 30, 2023 | 990 | $13,678,794 | $12,849,645 | $829,149 | $42,935,823 | $26,308,762 | $16,627,061 |
Financial details: 990 for the year ended June 30, 2025
Revenue
- Contributions, gifts and grants
- $3,717,245
- of which government grants
- $1,274,923
- Program service revenue
- $12,280,239
- Investment income
- $721,719
- Net rental income
- $53,983
- Net gain from sales of assets
- $208,711
- Net income from fundraising events
- $40,508
- Other revenue
- $122,959
Expenses
- Grants and similar amounts paid
- $2,575,275
- Compensation of officers, directors and key employees
- $946,487
- Other salaries and wages
- $5,779,804
- Salaries, compensation and benefits (total)
- $8,292,581
- Professional fundraising fees
- $19,661
- Legal fees
- $1,517
- Accounting fees
- $97,200
- Occupancy
- $984,767
- Travel
- $168,811
- Depreciation
- $729,441
- Program services (functional)
- $12,260,038
- Management and general (functional)
- $1,854,629
- Fundraising (functional)
- $417,977
Balance sheet and other
- Total assets, start of year
- $46,353,722
- Total assets, end of year
- $49,507,150
- Total liabilities, end of year
- $26,810,511
- Net assets, end of year
- $22,696,639
- Land, buildings and equipment
- $19,632,816
- Net assets without donor restrictions
- $16,020,614
- Net assets with donor restrictions
- $6,676,025
- Gross receipts
- $18,621,721
- Employees
- 142
- Volunteers
- 156
- Year formed
- 1977
- State of legal domicile
- CA
From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.
Officers, directors and key employees
As listed on the 990 for the year ended June 30, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| BILL PERRINE | HEAD OF SCHOOL Trustee or director, Officer | 40 | $301,946 | $128,001 |
| DIANA GREENSTONE | DIRECTOR OF FINANCE Officer | 40 | $177,000 | $27,531 |
| BEN FUSSINER | DIRECTOR OF UPPER SCHOOL Highest-paid employee | 40 | $113,761 | $41,472 |
| KATHLEEN HAZELTON-LEECH | PRIMARY TEACHER Highest-paid employee | 40 | $130,300 | $24,457 |
| MARY BISHOP | DIRECTOR OF DEVELOPMENT Highest-paid employee | 40 | $128,986 | $21,838 |
| VICTORIA HUERTA-MILLER | DIRECTOR OF LOWER SCHOOL Highest-paid employee | 40 | $117,847 | $15,794 |
| JESSE PEARSON | 7/8TH LANG TEACHER, TRUSTEE Trustee or director | 40 | $102,804 | $24,934 |
| ELIZABETH KEY | DIRECTOR OF ADMISSIONS Highest-paid employee | 40 | $109,692 | $13,670 |
| KELLEY GALLARDO | PRIMARY TEACHER, TRUSTEE Trustee or director | 40 | $79,346 | $24,730 |
| PETER BRYAN | CHAIR Trustee or director, Officer | 4 | $0 | $0 |
| JEN COYNE | VICE-CHAIR Trustee or director, Officer | 4 | $0 | $0 |
| ROHIT AGARWAL | SECRETARY Trustee or director, Officer | 1 | $0 | $0 |
| RYAN STEVER | TREASURER Trustee or director, Officer | 1 | $0 | $0 |
| ANDY DAVIES | TRUSTEE Trustee or director | 1 | $0 | $0 |
| BRETT FOLEY | TRUSTEE Trustee or director | 1 | $0 | $0 |
11 more people on this return
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| ASHLEY GOLDSMITH BUTTNER | TRUSTEE Trustee or director | 1 | $0 |
| CHARMAINE HO | TRUSTEE Trustee or director | 1 | $0 |
| MIRA KIM | TRUSTEE Trustee or director | 1 | $0 |
| KRISTIN LUNNY | TRUSTEE Trustee or director | 1 | $0 |
| LEXY LURIE | TRUSTEE Trustee or director | 1 | $0 |
| ASHLEY MACDONALD | TRUSTEE Trustee or director | 1 | $0 |
| TRIGG MCLEOD | TRUSTEE Trustee or director | 1 | $0 |
| TATEM READ | TRUSTEE Trustee or director | 1 | $0 |
| ELISABETH THURSTON FRASER | TRUSTEE Trustee or director | 1 | $0 |
| ROSAMOND POPE-MEYER | TRUSTEE Trustee or director | 1 | $0 |
| KATHRYN THOMPSON | TRUSTEE Trustee or director | 1 | $0 |
990 for the year ended June 30, 2024: 27 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| BILL PERRINE | HEAD OF SCHOOL Trustee or director, Officer | 40 | $296,306 | $125,758 |
| DIANA GREENSTONE | DIRECTOR OF FINANCE Officer | 40 | $154,146 | $17,438 |
| AUBYN DEMIAN | DIR OF MKTG & COMM/EA TO HEAD Highest-paid employee | 40 | $136,659 | $19,537 |
| KATHLEEN HAZELTON-LEECH | PRIMARY TEACHER Highest-paid employee | 40 | $129,112 | $25,295 |
| MARY BISHOP | DIRECTOR OF DEVELOPMENT Highest-paid employee | 40 | $123,940 | $19,984 |
| BEN FUSSINER | DIRECTOR OF UPPER SCHOOL Highest-paid employee | 40 | $109,632 | $22,855 |
| VICTORIA HUERTA-MILLER | DIRECTOR OF LOWER SCHOOL Highest-paid employee | 40 | $113,075 | $15,581 |
| SEAN HOW | MATH TEACHER, TRUSTEE Trustee or director | 40 | $103,946 | $16,118 |
| MORIAH GELLER | KINDERGARTEN TEACHER, TRUSTEE Trustee or director | 40 | $90,813 | $11,400 |
| PETER BRYAN | CHAIR Trustee or director, Officer | 4 | $0 | $0 |
| JEN COYNE | VICE-CHAIR Trustee or director, Officer | 4 | $0 | $0 |
| ROHIT AGARWAL | SECRETARY Trustee or director, Officer | 1 | $0 | $0 |
| RYAN STEVER | TREASURER Trustee or director, Officer | 1 | $0 | $0 |
| HANNE BARNES | TRUSTEE Trustee or director | 1 | $0 | $0 |
| ANDY DAVIES | TRUSTEE Trustee or director | 1 | $0 | $0 |
| JEFF ESCABAR | TRUSTEE (THRU 09/23) Trustee or director | 1 | $0 | $0 |
| BRETT FOLEY | TRUSTEE Trustee or director | 1 | $0 | $0 |
| ASHLEY GOLDSMITH BUTTNER | TRUSTEE Trustee or director | 1 | $0 | $0 |
| CHARMAINE HO | TRUSTEE Trustee or director | 1 | $0 | $0 |
| MIRA KIM | TRUSTEE Trustee or director | 1 | $0 | $0 |
| SHARON LEE | TRUSTEE Trustee or director | 1 | $0 | $0 |
| WARREN LEIDEN | TRUSTEE Trustee or director | 1 | $0 | $0 |
| KRISTIN LUNNY | TRUSTEE Trustee or director | 1 | $0 | $0 |
| LEXY LURIE | TRUSTEE Trustee or director | 1 | $0 | $0 |
| ASHLEY MACDONALD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| TRIGG MCLEOD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| TATEM READ | TRUSTEE Trustee or director | 4 | $0 | $0 |
990 for the year ended June 30, 2023: 27 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| BILL PERRINE | HEAD OF SCHOOL Trustee or director, Officer | 40 | $286,806 | $122,605 |
| DIANA R GREENSTONE | DIR. OF FINANCE Officer | 40 | $147,147 | $15,385 |
| AUBYN B DEMIAN | DIR OF MARKETING & COMM Highest-paid employee | 40 | $133,980 | $17,549 |
| KATHLEEN HAZELTON-LEECH | PRIMARY HEAD TEACHER Highest-paid employee | 40 | $125,331 | $22,416 |
| BEN FUSSINER | DIR. OF UPPER SCHOOL Highest-paid employee | 40 | $112,210 | $14,706 |
| SEAN HOW | MATH TEACHER, FINANCE Trustee or director | 40 | $101,425 | $11,032 |
| JULIA RIPPERTON | FIRST GRADE TEACHER (THRU 06/23) Trustee or director | 40 | $75,296 | $10,042 |
| TATEM READ | CHAIR Trustee or director, Officer | 4 | $0 | $0 |
| PETER BRYAN | VICE-CHAIR Trustee or director, Officer | 4 | $0 | $0 |
| RYAN STEVER | TREASURER Trustee or director, Officer | 1 | $0 | $0 |
| HANNE BARNES | SECRETARY Trustee or director, Officer | 1 | $0 | $0 |
| ROHIT AGARWAL | TRUSTEE Trustee or director | 1 | $0 | $0 |
| SHARMAN BONUS | TRUSTEE (THRU 06/23) Trustee or director | 1 | $0 | $0 |
| JEN COYNE | TRUSTEE Trustee or director | 2 | $0 | $0 |
| ANDY DAVIES | TRUSTEE Trustee or director | 1 | $0 | $0 |
| JACKIE DONOVAN | TRUSTEE (THRU 06/23) Trustee or director | 1 | $0 | $0 |
| JEFF ESCABAR | TRUSTEE Trustee or director | 1 | $0 | $0 |
| JAROM FAWSON | TRUSTEE (THRU 06/23) Trustee or director | 1 | $0 | $0 |
| BRETT FOLEY | TRUSTEE Trustee or director | 1 | $0 | $0 |
| ASHLEY GOLDSMITH BUTTNER | TRUSTEE Trustee or director | 1 | $0 | $0 |
| SEAN HOW | TRUSTEE Trustee or director | 1 | $0 | $0 |
| MIRA KIM | TRUSTEE Trustee or director | 1 | $0 | $0 |
| SHARON LEE | TRUSTEE Trustee or director | 1 | $0 | $0 |
| WARREN LEIDEN | TRUSTEE Trustee or director | 1 | $0 | $0 |
| LEXY LURIE | TRUSTEE Trustee or director | 1 | $0 | $0 |
| ASHLEY MACDONALD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| TRIGG MCLEOD | TRUSTEE Trustee or director | 1 | $0 | $0 |
Address and contacts
- Address (IRS master file)
- 305 MONTFORD AVE, MILL VALLEY, CA 94941-3370
- Principal officer (990 for 2024)
- DEREK DETTORRE, 305 MONTFORD AVENUE, MILL VALLEY, CA 94941
- Signed the 990
- DEREK DETTORRE, DIR OF FINANCE AND OPERATIONS
- Phone
- (415) 388-8408
- Website
- WWW.MARINHORIZON.ORG
- Return prepared by
- ARMANINO ADVISORY LLC
California records
California keeps its own records of charities and corporations. Search them by EIN 94-2427732 or by the name MARIN HORIZON SCHOOL INCORPORATED.
- Attorney General, Registry of Charities and Fundraisers
- Registration status and filed reports (CT-TR-1, RRF-1)
- Secretary of State, bizfile Online
- Corporation status, entity number, agent for service
- Franchise Tax Board
- Entity status letter (state tax exemption, good standing)
Mission
WE GROUND STUDENTS IN A DEEP SENSE OF BELONGING SO THEY BECOME ENTHUSIASTIC LEARNERS, DEVELOP CONFIDENT VOICES, AND EMERGE AS BEACONS OF KINDNESS IN THEIR COMMUNITIES.
Program accomplishments
- MARIN HORIZON SCHOOL IS AN INDEPENDENT, COED DAY SCHOOL FOR STUDENTS IN TODDLER THROUGH GRADE 8. LOCATED IN MILL VALLEY, CALIFORNIA, OUR CURRICULUM IS DESIGNED TO INSPIRE STUDENTS TO EMBRACE CHALLENGES, THINK CRITICALLY, AND BECOME COMPASSIONATE ADVOCATES. WE PRIORITIZE CLASS SIZES TO ALLOW THE DEVELOPMENT OF EXCEPTIONAL TEACHER-STUDENT RELATIONSHIPS AND INDIVIDUALIZED ATTENTION. WITHIN OUR INCLUSIVE COMMUNITY, EVERY STUDENT IS SEEN, HEARD, AND VALUED, FOSTERING A SENSE OF OWNERSHIP OVER THEIR EDUCATION AND AN EXPLORATION OF THEIR UNIQUE INTERESTS.Expenses $12,260,038 · grants $2,575,275 · revenue $12,308,707
What it must file and when
IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in June, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | June 30, 2026 | November 16, 2026 | Not due yet |
| 2024 | June 30, 2025 | November 17, 2025 | 990 on file |
| 2023 | June 30, 2024 | November 15, 2024 | 990 on file |
IRS record
- EIN
- 94-2427732
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- School
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 1977
- Accounting year ends
- June
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Education (B24Z)
- Assets (IRS master file)
- $49,507,150
- Income (IRS master file)
- $18,621,721
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | June 2025 | $16,842,162 | $14,532,644 | $49,507,150 | IRS |
| 990 | June 2024 | $16,229,609 | $13,870,477 | $46,353,722 | IRS |
| 990 | June 2023 | $13,678,794 | $12,849,645 | $42,935,823 | XML |
| 990 | June 2022 | $12,842,042 | $12,158,043 | $41,170,495 | IRS |
| 990 | June 2021 | – | – | – | IRS |
| 990 | June 2020 | – | – | – | IRS |
| 990 | June 2019 | – | – | – | IRS |
| 990 | June 2018 | – | – | – | IRS |
990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 94-2427732).
Questions about MARIN HORIZON SCHOOL INCORPORATED
- What is the EIN of MARIN HORIZON SCHOOL INCORPORATED?
- The employer identification number (EIN) of MARIN HORIZON SCHOOL INCORPORATED is 94-2427732.
- Is MARIN HORIZON SCHOOL INCORPORATED tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1977.
- Are donations to MARIN HORIZON SCHOOL INCORPORATED tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does MARIN HORIZON SCHOOL INCORPORATED file?
- Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
- When is the next return of MARIN HORIZON SCHOOL INCORPORATED due?
- The return for tax year 2025 (the year ending June 30, 2026) is due November 16, 2026. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did MARIN HORIZON SCHOOL INCORPORATED last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended June 2025.
- Who is the principal officer of MARIN HORIZON SCHOOL INCORPORATED?
- The 990 for the year ended June 30, 2025 names DEREK DETTORRE.
- Who are the officers and directors of MARIN HORIZON SCHOOL INCORPORATED?
- The 990 for the year ended June 30, 2025 lists 26 people; 9 received compensation from the organization, the highest $301,946 (BILL PERRINE, HEAD OF SCHOOL).
- How much revenue does MARIN HORIZON SCHOOL INCORPORATED have?
- On its 990 for the year ended June 30, 2025 it reported revenue of $16,842,162, expenses of $14,532,644 and total assets of $49,507,150 at year end.
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