Nonprofit · EIN 51-0083535
DELAWARE MUSEUM OF NATURE AND SCIENCE INC
Tax-exempt · WILMINGTON, DE 19807
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990 | $4,962,377 | $4,218,911 | $743,466 | $30,238,501 | $318,216 | $29,920,285 |
| December 31, 2024 | 990 | $2,569,200 | $3,905,710 | -$1,336,510 | $29,587,265 | $335,366 | $29,251,899 |
| December 31, 2023 | 990 | $2,967,313 | $3,684,316 | -$717,003 | $30,156,953 | $273,548 | $29,883,405 |
Financial details: 990 for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $1,497,826
- of which government grants
- $17,000
- Membership dues
- $182,478
- Program service revenue
- $916,959
- Investment income
- $2,208,554
- Net rental income
- $34,945
- Net gain from sales of assets
- $1,513,987
- Net income from fundraising events
- $139,506
- Net income from sales of inventory
- $145,936
- Other revenue
- $339,038
Expenses
- Grants and similar amounts paid
- $91,868
- Compensation of officers, directors and key employees
- $309,875
- Other salaries and wages
- $1,475,814
- Salaries, compensation and benefits (total)
- $2,053,427
- Professional fundraising fees
- $0
- Legal fees
- $5,032
- Accounting fees
- $20,500
- Occupancy
- $187,204
- Travel
- $41,123
- Depreciation
- $944,599
- Program services (functional)
- $3,538,176
- Management and general (functional)
- $417,382
- Fundraising (functional)
- $263,353
Balance sheet and other
- Total assets, start of year
- $29,587,265
- Total assets, end of year
- $30,238,501
- Total liabilities, end of year
- $318,216
- Net assets, end of year
- $29,920,285
- Land, buildings and equipment
- $12,592,550
- Publicly traded securities
- $17,085,677
- Net assets without donor restrictions
- $27,987,769
- Net assets with donor restrictions
- $1,932,516
- Gross receipts
- $8,869,203
- Employees
- 76
- Volunteers
- 94
- Year formed
- 1957
- State of legal domicile
- DE
From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.
Officers, directors and key employees
As listed on the 990 for the year ended December 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| MANDY SANTIAGO | EXECUTIVE DIRECTOR BEG 4/25 Officer | 40 | $113,889 | $3,562 |
| MICHELE HARVEY | CFO AND OPERATIONS DIRECTOR Officer | 40 | $100,685 | $7,703 |
| WILLIAM H SPRUANCE | ED THRU 3/25 & DIR EMER. THRU 12/25 Officer | 40 | $76,656 | $7,380 |
| EDA ROSS MONTGOMERY PHD | PRESIDENT Trustee or director, Officer | 1 | $0 | $0 |
| RICHARD F CAIRNS | VICE PRESIDENT Trustee or director, Officer | 1 | $0 | $0 |
| JOHN J KIRBY CPA | TREASURER Trustee or director, Officer | 1 | $0 | $0 |
| RONALD F LOGUE | SECRETARY Trustee or director, Officer | 1 | $0 | $0 |
| MYOSHI C AUBAIN | TRUSTEE Trustee or director | 1 | $0 | $0 |
| NICHOLAS BROKAW PHD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| NINA LS BURNAFORD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| DEIRDRE DOHERTY PHD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| E BRADFORD DU PONT JR | TRUSTEE Trustee or director | 1 | $0 | $0 |
| KURT M HEYMAN | TRUSTEE Trustee or director | 1 | $0 | $0 |
| MICHAEL HUTCHINSON | TRUSTEE Trustee or director | 1 | $0 | $0 |
| JENNIFER KMIEC | TRUSTEE Trustee or director | 1 | $0 | $0 |
6 more people on this return
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| IAN R MCCONNEL | TRUSTEE Trustee or director | 1 | $0 |
| EDWARD T NOVAK | TRUSTEE Trustee or director | 1 | $0 |
| ALOK PATEL | TRUSTEE Trustee or director | 1 | $0 |
| RACHEL SPENCE SIEGEL | TRUSTEE Trustee or director | 1 | $0 |
| FABRICE VERON PHD | TRUSTEE Trustee or director | 1 | $0 |
| TIMOTHY B WEYMOUTH | TRUSTEE Trustee or director | 1 | $0 |
990 for the year ended December 31, 2024: 19 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| WILLIAM H SPRUANCE | EXEC. DIR.,TRUSTEE LIAISON Officer | 40 | $131,132 | $9,974 |
| EDA MONTGOMERY PHD | PRESIDENT Trustee or director, Officer | 1 | $0 | $0 |
| RICHARD F CAIRNS | VICE PRESIDENT Trustee or director, Officer | 1 | $0 | $0 |
| GEORGE B TRAMMELL | TREASURER Trustee or director, Officer | 1 | $0 | $0 |
| JOHN S LARSON | SECRETARY Trustee or director, Officer | 1 | $0 | $0 |
| MYOSHI C AUBAIN | TRUSTEE Trustee or director | 1 | $0 | $0 |
| NICHOLAS BROKAW PHD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| NINA BURNAFORD ESQ | TRUSTEE Trustee or director | 1 | $0 | $0 |
| DEIRDRE DOHERTY PHD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| E BRADFORD DU PONT JR | TRUSTEE Trustee or director | 1 | $0 | $0 |
| SAMUEL I HYLAND | TRUSTEE Trustee or director | 1 | $0 | $0 |
| JENNIFER KMIEC | TRUSTEE Trustee or director | 1 | $0 | $0 |
| IAN R MCCONNEL | TRUSTEE Trustee or director | 1 | $0 | $0 |
| EDWARD T NOVAK | TRUSTEE Trustee or director | 1 | $0 | $0 |
| ALOK PATEL | TRUSTEE Trustee or director | 1 | $0 | $0 |
| ELYSE RATSEP | TRUSTEE Trustee or director | 1 | $0 | $0 |
| DAVID A RUSENKO CPA | TRUSTEE Trustee or director | 1 | $0 | $0 |
| FABRICE VERON PHD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| TIMOTHY B WEYMOUTH | TRUSTEE Trustee or director | 1 | $0 | $0 |
990 for the year ended December 31, 2023: 21 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| WILLIAM H SPRUANCE | EXEC. DIR.,TRUSTEE LIAISON Officer | 40 | $149,751 | $10,283 |
| RONALD F LOGUE CPA CTFA | PRESIDENT Trustee or director, Officer | 1 | $0 | $0 |
| EDA MONTGOMERY PHD | VICE PRESIDENT Trustee or director, Officer | 1 | $0 | $0 |
| GEORGE B TRAMMELL | TREASURER Trustee or director, Officer | 1 | $0 | $0 |
| JOHN S LARSON | SECRETARY Trustee or director, Officer | 1 | $0 | $0 |
| NICHOLAS BROKAW PHD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| NINA BURNAFORD ESQ | TRUSTEE Trustee or director | 1 | $0 | $0 |
| DEIRDRE DOHERTY PHD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| E BRADFORD DU PONT JR | TRUSTEE Trustee or director | 1 | $0 | $0 |
| KURT M HEYMAN ESQ | TRUSTEE Trustee or director | 1 | $0 | $0 |
| SAMUEL I HYLAND | TRUSTEE Trustee or director | 1 | $0 | $0 |
| JOHN J KIRBY CPA | TRUSTEE Trustee or director | 1 | $0 | $0 |
| JENNIFER KMIEC | TRUSTEE Trustee or director | 1 | $0 | $0 |
| IAN R MCCONNEL | TRUSTEE Trustee or director | 1 | $0 | $0 |
| AMANDA K KONYK ESQ | TRUSTEE -(UNTIL 2/23) Trustee or director | 1 | $0 | $0 |
| ALOK PATEL | TRUSTEE Trustee or director | 1 | $0 | $0 |
| ELYSE RATSEP | TRUSTEE Trustee or director | 1 | $0 | $0 |
| DAVID RUSENKO CPA | TRUSTEE Trustee or director | 1 | $0 | $0 |
| THOMAS A UEBLER ESQ | TRUSTEE Trustee or director | 1 | $0 | $0 |
| FABRICE VERON PHD | TRUSTEE Trustee or director | 1 | $0 | $0 |
| TIMOTHY B WEYMOUTH | TRUSTEE Trustee or director | 1 | $0 | $0 |
Address and contacts
- Address (IRS master file)
- PO BOX 3937, WILMINGTON, DE 19807-0937
- Principal officer (990 for 2025)
- MICHELE HARVEY, PO BOX 3937, WILMINGTON, DE 19807
- Signed the 990
- MANDY SANTIAGO, EXECUTIVE DIRECTOR
- Phone
- (302) 658-9111
- Website
- WWW.DELMNS.ORG
- Return prepared by
- BELFINT LYONS & SHUMAN PA
Mission
THE MUSEUM IS AN EDUCATIONAL CORPORATION FORMED TO IGNITE A LIFE-LONG PASSION FOR EXPLORING, DISCOVERING, AND VALUING NATURE AND SCIENCE.
Program accomplishments
- IN 2025, THE DELAWARE MUSEUM OF NATURE AND SCIENCE WELCOMED 82,535 GUESTS: 57% FROM GENERAL, MEMBER, RECIPROCAL AND DISCOUNTED ADMISSION; 21% FROM FORMAL EDUCATION PROGRAMS INCLUDING SCHOOL TOURS, SCOUTS AND CAMPS; 19% FROM SPECIAL EVENTS, BIRTHDAY PARTIES AND RENTALS; 3% FROM MISCELLANEOUS VISITION. THE GALLERIES INCLUDED THE REGIONAL JOURNEY GALLERY, THE ALISON K. BRADFORD GLOBAL JOURNAL GALLERY, THE ELLICE AND ROSA MCDONALD FONDATION PALEOZONE, HANDS ON EXPERIENCES IN THE PNC GROW-UP GREAT NATURE NOOK AND THE BILL AND DENISE SPENCE DISCOVERY GALLERY, AND THE EDERIC EXHIBITION HALL, WHICH HOSTED TWO TRAVELING EXHIBITS.Expenses $2,505,347 · grants $91,868 · revenue $1,116,491
- THE DELAWARE MUSEUM OF NATURE AND SCIENCE MAINTAINS A LIBRARY, LABORATORIES, AND EXTENSIVE SCIENTIFIC COLLECTIONS USED BY RESEARCHERS WORLDWIDE. THESE COLLECTIONS INCLUDE: MALACOLOGY (2.3 MILLION SPECIMENS), ORNITHOLOGY (113,000 SPECIMENS), MAMMALOGY (6,000 SPECIMENS), AND SMALLER ENTOMOLOGY, PALEONTOLOGY AND BOTANY COLLECTIONS.Expenses $1,032,829
What it must file and when
IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | 990 on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990 on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990 on file |
IRS record
- EIN
- 51-0083535
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (170(b)(1)(A)(vi))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 1959
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Assets (IRS master file)
- $30,238,501
- Income (IRS master file)
- $8,869,203
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2025 | $4,962,377 | $4,218,911 | $30,238,501 | XML |
| 990 | December 2024 | $2,569,200 | $3,905,710 | $29,587,265 | XML |
| 990 | December 2023 | $2,967,313 | $3,684,316 | $30,156,953 | XML |
| 990 | December 2022 | $2,364,916 | $3,177,636 | $29,399,998 | IRS |
| 990 | December 2021 | – | – | – | IRS |
| 990 | December 2020 | – | – | – | IRS |
| 990 | December 2018 | – | – | – | IRS |
990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 51-0083535).
Questions about DELAWARE MUSEUM OF NATURE AND SCIENCE INC
- What is the EIN of DELAWARE MUSEUM OF NATURE AND SCIENCE INC?
- The employer identification number (EIN) of DELAWARE MUSEUM OF NATURE AND SCIENCE INC is 51-0083535.
- Is DELAWARE MUSEUM OF NATURE AND SCIENCE INC tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1959.
- Are donations to DELAWARE MUSEUM OF NATURE AND SCIENCE INC tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does DELAWARE MUSEUM OF NATURE AND SCIENCE INC file?
- Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
- When is the next return of DELAWARE MUSEUM OF NATURE AND SCIENCE INC due?
- The return for tax year 2026 (the year ending December 31, 2026) is due May 17, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did DELAWARE MUSEUM OF NATURE AND SCIENCE INC last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended December 2025.
- Who is the principal officer of DELAWARE MUSEUM OF NATURE AND SCIENCE INC?
- The 990 for the year ended December 31, 2025 names MICHELE HARVEY.
- Who are the officers and directors of DELAWARE MUSEUM OF NATURE AND SCIENCE INC?
- The 990 for the year ended December 31, 2025 lists 21 people; 3 received compensation from the organization, the highest $113,889 (MANDY SANTIAGO, EXECUTIVE DIRECTOR BEG 4/25).
- How much revenue does DELAWARE MUSEUM OF NATURE AND SCIENCE INC have?
- On its 990 for the year ended December 31, 2025 it reported revenue of $4,962,377, expenses of $4,218,911 and total assets of $30,238,501 at year end.
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