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Governance Register
US nonprofit · EIN 460377948 · Gettysburg, SDiSource and licenceOrganisation record IRS Exempt Organizations Business Master File (EIN 460377948) - 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 31 December 2025: assets, liabilities, staff, website, telephone, pay.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

Dakota Sunset Museum Inc's network

11 people1 organisationi11 people and 1 organisation on this map.The large node is the subject of this page. Solid lines are what the register itself records (11). 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

11 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 11 voting members of its governing body on its latest Form 990 Part VI, which matches the board listed here.
NameRole as filedSinceOn the board
Bob PottsPresident & Director2020
6 yrs
Dan OsierDirector2020
6 yrs
David LarsonDirector2020
6 yrs
Eileen JostDirector2020
6 yrs
Holly WrightDirector2020
6 yrs
Judy HellhakeSecretary & Director2020
6 yrs
Kathleen SchlachterDirector2020
6 yrs
Ken IversonVice President & Director2020
6 yrs
Mark RobbennoltDirector2020
6 yrs
Mary Carol PottsCurator, Treasurer & Director2020
6 yrs
Mary QuiettDirector2020
6 yrs
Under 5 years5 to 6 years6 years or moreShow all 11 →

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.
NameTitle as filedHours a weekPay from the organisationRelated organisationsOther
Mary Carol PottsCurator, Treasurer & Director20$16k
Jamie HagemanDirector0$0
Dan OsierDirector0$0
Judy HellhakeSecretary & Director1$0
Kara WilliamsDirector1$0
Mark RobbennoltDirector0$0
Bob PottsPresident & Director1$0
Cindi ForgeyVice-President & Director1$0
Bert van EssenDirector0$0
Kathleen SchlachterDirector0$0

About

Legal name
Dakota Sunset Museum Inc
EIN
460377948
Address
205 W Commercial Ave Ste 104, Gettysburg, SD, 57442-1103
State
South Dakota
Mission
To collect, preserve and display articles, specimens and data touching on the early history of south dakota and the united states (as filed on the Form 990)
Activity (NTEE)
A540 Arts, culture and humanities
IRS classification
501(c)03 (tax-exempt under section 501(c)(3) where shown)
Classified purpose
Arts, Culture & Humanities
Size band
5 (IRS master file code)
Formed
1984
Principal officer
Bob Potts (as named on the Form 990)
IRS ruling date
1 March 1985
Status
Code 01 (unconditional exemption)
Form 990 filings on record
4, latest 2023
IRS Publication 78
PC (contributions deductible)

Most connected

Longest observed on the filings

≥6years on the filingsBob Potts
≥6years on the filingsDan Osier
≥6years on the filingsDavid Larson
≥6years on the filingsEileen Jost

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
$699k
Total liabilities
$0
Net assets or fund balances
$699k
Contributions and grants received
$74k
Program service revenue
$0
Employees
6
Volunteers
4