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US nonprofit · EIN 680280522 · Tiburon, CAiSource and licenceOrganisation record IRS Exempt Organizations Business Master File (EIN 680280522) - NTEE activity code, address.Board and officers IRS Form 990 annual filings, Part VII (directors, trustees, officers, key employees), read year by year to observe tenure.Latest return IRS Form 990 series e-file data - 990 for the year to 30 June 2025: assets, liabilities, staff, website, telephone, pay.Finances by year IRS Form 990 e-file data - total revenue and total expenses by tax year.Renewal outlook Computed by Governance Register from the observed filing history and filed revenue (us-approach-v4-clean). Not a statement that the organisation is recruiting.Deductibility IRS Publication 78 data (code PC), downloaded 18 October 2026.Licence US Federal Government public domain.How we handle data

Belvedere-Tiburon Library Foundation

Donations deductible
Revenue
$681k
year to 30 June 2025
Expenses
$470k
year to 30 June 2025
Total assets
$1.2m
$355k liabilities
Net assets
$861k
assets less liabilities
Directors and trustees
15
3.7y av
Staff
1
13 volunteers
Left since last filing
0
no seats appear to have opened
Officers and senior staff
6
named in Part VII
How am I connected?

Belvedere-Tiburon Library Foundation's network

15 people10 organisationsi15 people and 10 organisations on this map.The large node is the subject of this page. Solid lines are what the register itself records (15). Violet dotted lines (10) are likely: the same full name sits on the current board of another organisation in the same register and region. Form 990 filings give names without a person identifier; SEC insider filings carry a CIK. It may be a different person.

The board

15 listediTime on the board is observed from the annual filings: the IRS files no appointment date, so the bar counts years from the first filing the person appears on - a lower bound, not a filed start date. Names are exactly as filed. The IRS publishes no person identifier, so this edition does not yet link a person across organisations in the tables. The network map shows same-name matches as likely links only, never as confirmed.Tenure and departures are observed across annual filings. Observed tenure is a lower bound - a member may have joined before the first year on record. The organisation reported 15 voting members of its governing body on its latest Form 990 Part VI, which matches the board listed here.
NameRole as filedSinceOn the board
Ann AylwinDirector2018
8 yrs
Aviva BoedeckerDirector2020
6 yrs
Brenda BottumDirector2021
5 yrs
Crystal DuranDirector2024
2 yrs
Heather LobdellDirector2024
2 yrs
Kelly LauberDirector2021
5 yrs
Lucy ChurtonPresident2023
3 yrs
Marty WinterDirector2021
5 yrs
Michelle ThomsenCompany secretary2024
2 yrs
Michelyn GoodDirector2024
2 yrs
Mickey HubbellVice President2024
2 yrs
Sophia GhaffaryDirector2025
1 yr
Sylvia SinghDirector2023
3 yrs
Toni LeeTreasurer2024
2 yrs
Tony HookerDirector2025
1 yr
Under 5 years5 to 6 years6 years or moreShow all 15 →

Officers and senior leadership

6 listediNamed in Part VII as officers, key employees or highest-compensated staff - not board members, shown for completeness.
NameTitle as filedOn the filings
Ann AylwinVice President2019
Barry MossTreasurersince 2018
Doug NorbyPresident & CEO2018
Jenna ErviceExecutive Directorsince 2020
John KunzweilerTreasurersince 2018
Rachel KertzExecutive Dir.2019

Pay and hours

year to 30 June 2025iFrom Part VII of the Form 990: compensation reported for each officer, director, trustee, key employee and highest-paid staff member, and the average hours a week they report. Most board members are unpaid; a blank means nothing was reported. Pay from related organisations is shown separately.
NameTitle as filedHours a weekPay from the organisationRelated organisationsOther
Lucy ChurtonPresident15$0
Mickey HubbellVice President10$0
Michelle ThomsenSecretary10$0
Toni LeeTreasurer10$0
Ann AylwinDirector5$0
Aviva BoedeckerDirector5$0
Brenda BottumDirector5$0
Kelly LauberDirector5$0
Heather LobdellDirector5$0
Sylvia SinghDirector5$0
Marty WinterDirector5$0
Crystal DuranDirector5$0
Michelyn GoodDirector5$0
Tony HookerDirector5$0
Sophia GhaffaryDirector5$0

No pay was reported for anyone in Part VII on this return.

About

Legal name
Belvedere-Tiburon Library Foundation
EIN
680280522
Address
Po Box 483, Tiburon, CA, 94920-0483
State
California
Mission
To support the Belvedere Tiburon Library through fundraising projects, private philanthropy, and advocacy. (as filed on the Form 990)
Activity (NTEE)
B99Z Education
IRS classification
501(c)03 (tax-exempt under section 501(c)(3) where shown)
Classified purpose
Education
Size band
6 (IRS master file code)
Formed
1992
IRS ruling date
1 November 1996
Status
Code 01 (unconditional exemption)
Form 990 filings on record
8, latest 2025
IRS Publication 78
PC (contributions deductible)

Most connected

Longest observed on the filings

≥8years on the filingsAnn Aylwin
≥6years on the filingsAviva Boedecker
≥5years on the filingsBrenda Bottum
≥5years on the filingsKelly Lauber

Latest return

year to 30 June 2025iFigures from the newest Form 990 or 990-EZ in the IRS e-file releases of 2025 and 2026, for the year ending 30 June 2025. US dollars, as filed.
Total assets
$1.2m
Total liabilities
$355k
Net assets or fund balances
$861k
Contributions and grants received
$586k
Program service revenue
$62k
Employees
1
Volunteers
13

Filed finances

1 yeariTotals as filed on the IRS Form 990 (revenue and expenses), by tax year.
Tax yearTotal revenueTotal expensesSurplus or deficit
2024$681k$470k$211k

As filed on the IRS Form 990. US dollars.