Bainbridge Island Historical Society
Donations deductibleRevenue
$1m
year to 31 December 2025
Expenses
$543k
year to 31 December 2025
Total assets
$3.3m
$8k liabilities
Net assets
$3.3m
assets less liabilities
Directors and trustees
12
5.4 years on average
Staff
7
50 volunteers
Left since last filing
0
no seats appear to have opened
Officers and senior staff
2
named in Part VII
Bainbridge Island Historical Society's network
12 people1 organisationi12 people and 1 organisation on this map.The large node is the subject of this page. Solid lines are what the register itself records (12). Violet dotted lines (1) 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
12 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.Time served and departures are observed across annual filings. Observed time served is a lower bound - a member may have joined before the first year on record. The organisation reported 12 voting members of its governing body on its latest Form 990 Part VI, which matches the board listed here.| Name | Role as filed | Since | On the board |
|---|---|---|---|
| Bruce Genung | Board Member | 2021 | 5 yrs |
| Coleen Turner | Board Member | 2024 | 2 yrs |
| David C Williams (also filed as Dave Williams, David Williams) | Board Member | 2018 | 8 yrs |
| Jenny Peters | Vice President | 2018 | 8 yrs |
| Joan Walters | Board Member | 2018 | 8 yrs |
| Joe Stanko | Board Member | 2023 | 3 yrs |
| John M Klimp (also filed as John Klimp) | Board Member | 2018 | 8 yrs |
| Kevin Dwyer | Board Member | 2024 | 2 yrs |
| Kevin Tomlinson | Board Member | 2024 | 2 yrs |
| Mark Mumm | Treasurer | 2020 | 6 yrs |
| Michael Bronsdon | President | 2024 | 2 yrs |
| Susie Burdick | Board Member | 2020 | 6 yrs |
Officers and senior leadership
2 listediNamed in Part VII as officers, key employees or highest-compensated staff - not board members, shown for completeness.| Name | Title as filed | On the filings |
|---|---|---|
| Amber Silvey-Buell | Executive Director | since 2022 |
| Brianna R Kosowitz | Executive Director | 2021 |
Pay and hours
year to 31 December 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.| Name | Title as filed | Hours a week | Pay from the organisation | Related organisations | Other |
|---|---|---|---|---|---|
| Susie Burdick | Board Member | 0 | $0 | ||
| John Klimp | Board Member | 0 | $0 | ||
| Mark Mumm | Treasurer | 0 | $0 | ||
| Joan Walters | Board Member | 0 | $0 | ||
| Bruce Genung | Board Member | 0 | $0 | ||
| Jenny Peters | Vice President | 0 | $0 | ||
| Joe Stanko | Board Member | 0 | $0 | ||
| Michael Bronsdon | President | 0 | $0 | ||
| Kevin Tomlinson | Board Member | 0 | $0 | ||
| Kevin Dwyer | Board Member | 0 | $0 | ||
| Coleen Turner | Board Member | 0 | $0 | ||
| David Williams | Board Member | 0 | $0 | ||
| Amber Silvey-Buell | Executive Director | 0 | $0 |
No pay was reported for anyone in Part VII on this return.
About
- Legal name
- Bainbridge Island Historical Society
- EIN
- 911037866
- Address
- 215 Ericksen Ave Ne, Bainbridge Is, WA, 98110-1855
- State
- Washington
- Mission
- Preserve and share the stories of Bainbridge Island to promote a greater understanding of our community and the world in which we live; And, to operate a Historic Museum and Library (as filed on the Form 990)
- IRS classification
- 501(c)03 (tax-exempt under section 501(c)(3) where shown)
- Size band
- 6 (IRS master file code)
- Formed
- 1949
- Principal officer
- Mark Mumm (as named on the Form 990)
- IRS ruling date
- 1 June 1988
- 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 filingsDavid C Williams
≥8years on the filingsJenny Peters
≥8years on the filingsJoan Walters
≥8years on the filingsJohn M Klimp
Latest return
year to 31 December 2025iFigures from the newest Form 990 or 990-EZ in the IRS e-file releases of 2025 and 2026, for the year ending 31 December 2025. US dollars, as filed.- Total assets
- $3.3m
- Total liabilities
- $8k
- Net assets or fund balances
- $3.3m
- Contributions and grants received
- $286k
- Program service revenue
- $0
- Employees
- 7
- Volunteers
- 50
Filed finances
1 yeariTotals as filed on the IRS Form 990 (revenue and expenses), by tax year.| Tax year | Total revenue | Total expenses | Surplus or deficit |
|---|---|---|---|
| 2024 | $449k | $493k | Deficit $45k |
As filed on the IRS Form 990. US dollars.