Cosmos Club's network
18 people1 organisationi18 people and 1 organisation on this map.The large node is the subject of this page. Solid lines are what the register itself records (18). 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
18 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 15 voting members of its governing body on its latest Form 990 Part VI; we list 18 in Part VII (Part VII does not always name every voting member).| Name | Role as filed | Since | On the board |
|---|---|---|---|
| Abigail Rian Evans | Board Member 2022 - 2023 | 2021 | 5 yrs |
| Arthur E Wise | Vice President 2023 | 2018 | 8 yrs |
| Clarion E Johnson | Board Member 2022 - 2023 | 2021 | 5 yrs |
| D Elizabeth Crompton | Board Member 2022 - 2023 | 2021 | 5 yrs |
| E William Colglazier | Board Member 2023 | 2023 | 3 yrs |
| Elizabeth L C Beck (also filed as Elizabeth LC Beck) | Past President 2023, President 2022 | 2019 | 7 yrs |
| Janice Koch | Secretary 2022 | 2021 | 5 yrs |
| Kevin P Sheehan | Asst. Treasurer 2022 - 2023 | 2022 | 4 yrs |
| Mark E Greenwold | Board Member 2023 | 2023 | 3 yrs |
| Michael N Pocalyko | President 2023, Vice President 2022 | 2020 | 6 yrs |
| Miriam McIntire Nisbet | Secretary 2023, Board Member 2022 | 2020 | 6 yrs |
| Paul A Eckert | Board Member 2023 | 2023 | 3 yrs |
| Philip J Marion | Board Member 2022 - 2023 | 2022 | 4 yrs |
| Richard B Herzog | Board Member 2022 | 2020 | 6 yrs |
| Sherman E Katz | Board Member 2022 - 2023 | 2022 | 4 yrs |
| Susan J Koch | Board Member 2022 | 2020 | 6 yrs |
| Thomas B Cochran | Board Member 2023 | 2023 | 3 yrs |
| Zoe CB Sharp (also filed as Zoe Sharp) | Treasurer 2022 -2023 | 2020 | 6 yrs |
Officers and senior leadership
10 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 |
|---|---|---|
| Carolyn Rehman | Director of Human Resources | 2022 |
| Carolyn Ruffner | Director of Human Resources | 2023 |
| Christopher Buynak | Controller | since 2018 |
| Christopher Line | Building Engineer | since 2018 |
| EUN YIM | Director of Food and Beverage | since 2022 |
| James Lowder | Director of Housekeeping | since 2022 |
| Mark Linquist | Executive Sous Chef | since 2022 |
| Mitchell Platt | General Manager | since 2018 |
| Sandra McDowell | Assistant Gm | since 2018 |
| William Rogers | Executive Chef | since 2018 |
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.| Name | Title as filed | Hours a week | Pay from the organisation | Related organisations | Other |
|---|---|---|---|---|---|
| Mitchell Platt | General Manager | 40 | $674k | $73k | |
| Christopher Buynak | Controller | 40 | $220k | $47k | |
| William Rogers | Executive Chef | 40 | $211k | $42k | |
| Sandra McDowell | Assistant General Manager | 40 | $183k | $37k | |
| Christopher Line | Building Engineer | 40 | $154k | $41k | |
| Carolyn Ruffner | Director of Human Resource | 40 | $153k | $38k | |
| Peter L Winik | President 2025, Vice President 2024 | 7 | $0 | ||
| Philip J Marion | Vice President 2025 | 7 | $0 | ||
| Kevin P Sheehan | Treasurer 2024 - 2025 | 7 | $0 | ||
| Mark D Young | Secretary 2025 | 7 | $0 | ||
| Miriam McIntire Nisbet | Secretary 2024 | 7 | $0 | ||
| Susan Farrell | Asst. Secretary 2024 - 2025 | 7 | $0 | ||
| Katarina A J Weir | Asst. Treasurer | 7 | $0 | ||
| Arthur E Wise | Past President 2025, President 2024 | 7 | $0 | ||
| Lee Ann Potter | Board Member 2024 - 2025 | 4 | $0 | ||
| Douglas B Kamerow | Board Member 2024 - 2025 | 4 | $0 | ||
| Mark E Greenwold | Board Member 2024 - 2025 | 4 | $0 | ||
| Thomas B Cochran | Board Member 2024 - 2025 | 4 | $0 | ||
| Paul A Eckert | Board Member 2024 - 2025 | 4 | $0 | ||
| Zoe Cb Sharp | Board Member 2024 - 2025 | 4 | $0 | ||
| C Naseer Ahmad | Board Member 2025 | 4 | $0 | ||
| John W Franklin | Board Member 2025 | 4 | $0 | ||
| Pamela Greifeld Shortal | Board Member 2025 | 4 | $0 | ||
| Sherman E Katz | Board Member 2024 | 4 | $0 | ||
| E William Colglazier | Board Member 2024 | 4 | $0 |
About
- Legal name
- Cosmos Club
- EIN
- 530052500
- Address
- 2121 Massachusetts Ave Nw, Washington, DC, 20008-3639
- State
- District of Columbia
- Mission
- The organization's mission is to advance and enhance the interests and public expression of its members in science, literature, and the arts; their mutual improvement by social interaction; and the maintenance of a library and other permanent collections. A common theme among the members of the cosmos club is their relation with scholarship, creative genius, or intellectual distinction. (as filed on the Form 990)
- IRS classification
- 501(c)07 (tax-exempt under section 501(c)(3) where shown)
- Size band
- 8 (IRS master file code)
- Formed
- 1878
- Principal officer
- Kevin Sheehan (as named on the Form 990)
- IRS ruling date
- 1 March 1932
- Status
- Code 01 (unconditional exemption)
- Form 990 filings on record
- 6, latest 2023
Most connected
Related organisations (Schedule R)
Longest observed on the filings
≥8years on the filingsArthur E Wise
≥7years on the filingsElizabeth L C Beck
≥6years on the filingsMichael N Pocalyko
≥6years on the filingsMiriam McIntire Nisbet
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
- $29.8m
- Total liabilities
- $7m
- Net assets or fund balances
- $22.7m
- Contributions and grants received
- $103k
- Program service revenue
- $11.1m
- Employees
- 180
- Volunteers
- 300
State registration
1 entityiBusiness-entity registers published by US states. These records are matched to this organisation by name and state, not by EIN, and are labelled as likely matches. Street addresses are not shown.Cosmos Club likely matchiMatched by exact name and state (and ZIP where shown). State registers do not publish EINs, so this is not a confirmed match. Source: DC Department of Licensing and Consumer Protection (DLCP), corporate registrations (opendata.dc.gov). Licence: CC BY 4.0. Attribution: DC DLCP. Data last fetched 18 October 2026.
- State
- District of Columbia
- Entity type
- Domestic Nonprofit Corporation
- Status
- Active - In Good Standing
- Formed
- 13 December 1878
- Registered agent
- Mitchell Platt (city and state not held)