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US nonprofit · EIN 522341260 · Rock Hall, MDiSource and licenceOrganisation record IRS Exempt Organizations Business Master File (EIN 522341260) - 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 2024: 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

Mainstay Inc

Donations deductible
Revenue
$263k
year to 31 December 2024
Expenses
$239k
year to 31 December 2024
Total assets
$386k
$600 liabilities
Net assets
$385k
assets less liabilities
Directors and trustees
7
4.0y av
Staff
4
10 volunteers
Left since last filing
0
no seats appear to have opened
Officers and senior staff
8
named in Part VII
How am I connected?

Mainstay Inc's network

7 people1 organisationi7 people and 1 organisation on this map.The large node is the subject of this page. Solid lines are what the register itself records (7). 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

7 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; we list 7 in Part VII (Part VII does not always name every voting member).
NameRole as filedSinceOn the board
Adrian CottonBoard Member2022
4 yrs
Barbara ParkerBoard Member2022
4 yrs
Brian ColeBoard Member2022
4 yrs
Dave SharpBoard Member2023
3 yrs
Julie GillBoard Member2023
3 yrs
Karen FrisonBoard Member2022
4 yrs
Regina OliverBoard Member2023
3 yrs
Under 5 years5 to 6 years6 years or more

Officers and senior leadership

8 listediNamed in Part VII as officers, key employees or highest-compensated staff - not board members, shown for completeness.
NameTitle as filedOn the filings
Barbara ParkerPresident2023
Debra WoodruffCompany secretarysince 2023
Jacquelyn CaineEmployee2022
Mark EinsteinPresident2024
Matthew MielnickExecutive Directorsince 2022
Palmatary G DanielEmployee2022
Robert DunlapVice Presidentsince 2023
Robert MillerTreasurersince 2023

Pay and hours

year to 31 December 2024iFrom 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
Mark EinsteinPresident5$0
Robert DunlapVice President5$0
Debra WoodruffSecretary5$0
Robert MillerTreasurer5$0
Brian ColeBoard Member2$0
Karen FrisonBoard Member2$0
Adrian CottonBoard Member2$0
Barbara ParkerBoard Member2$0
Dave SharpBoard Member2$0
Julie GillBoard Member2$0
Regina OliverBoard Member2$0
Matt MielnickExecutive Director40$0

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

About

Legal name
Mainstay Inc
EIN
522341260
Address
Po Box 238, Rock Hall, MD, 21661-0238
State
Maryland
Mission
The Mainstay, dedicated to performing arts education, features well-known national, international, and local musical artists. It is a unique venue for people who have a passion for music and desire to support the unique rural fishing community of Rock Hall. The Mainstay is accessable to the Eastern Shore and as well as Baltimore, Annapolis, Washington, DC, Wilmington, and Philadelphia. (as filed on the Form 990)
Activity (NTEE)
N99 Recreation and sports
IRS classification
501(c)03 (tax-exempt under section 501(c)(3) where shown)
Classified purpose
Recreation & Sports
Size band
4 (IRS master file code)
Formed
1997
Principal officer
Robert B Miller (as named on the Form 990)
IRS ruling date
1 September 2009
Status
Code 01 (unconditional exemption)
Form 990 filings on record
6, latest 2024
IRS Publication 78
PC (contributions deductible)

Most connected

Longest observed on the filings

≥4years on the filingsAdrian Cotton
≥4years on the filingsBarbara Parker
≥4years on the filingsBrian Cole
≥4years on the filingsKaren Frison

Latest return

year to 31 December 2024iFigures from the newest Form 990 or 990-EZ in the IRS e-file releases of 2025 and 2026, for the year ending 31 December 2024. US dollars, as filed.
Total assets
$386k
Total liabilities
$600
Net assets or fund balances
$385k
Contributions and grants received
$149k
Program service revenue
$102k
Employees
4
Volunteers
10

Filed finances

1 yeariTotals as filed on the IRS Form 990 (revenue and expenses), by tax year.
Tax yearTotal revenueTotal expensesSurplus or deficit
2024$263k$239k$24k

As filed on the IRS Form 990. US dollars.