Nonprofit · EIN 23-7042291
ASPEN CENTER FOR ENVIRONMENTAL STUDIES
Tax-exempt · ASPEN, CO 81611
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| October 31, 2025 | 990 | $6,250,553 | $5,018,774 | $1,231,779 | $39,643,797 | $789,620 | $38,854,177 |
| October 31, 2024 | 990 | $5,880,494 | $4,211,814 | $1,668,680 | $38,720,736 | $1,424,595 | $37,296,141 |
| October 31, 2023 | 990 | $5,628,622 | $3,964,246 | $1,664,376 | $36,862,201 | $1,765,944 | $35,096,257 |
Financial details: 990 for the year ended October 31, 2025
Revenue
- Contributions, gifts and grants
- $4,848,390
- of which government grants
- $181,598
- Membership dues
- $287,013
- Program service revenue
- $1,222,485
- Investment income
- $135,539
- Net gain from sales of assets
- -$8,162
- Net income from fundraising events
- $44,139
- Other revenue
- $44,139
Expenses
- Grants and similar amounts paid
- $0
- Other salaries and wages
- $2,402,350
- Salaries, compensation and benefits (total)
- $2,930,959
- Professional fundraising fees
- $0
- Occupancy
- $476,323
- Travel
- $22,041
- Depreciation
- $550,766
- Program services (functional)
- $3,687,710
- Management and general (functional)
- $642,791
- Fundraising (functional)
- $688,273
Balance sheet and other
- Total assets, start of year
- $38,720,736
- Total assets, end of year
- $39,643,797
- Total liabilities, end of year
- $789,620
- Net assets, end of year
- $38,854,177
- Land, buildings and equipment
- $28,742,383
- Publicly traded securities
- $8,761,858
- Net assets without donor restrictions
- $37,072,507
- Net assets with donor restrictions
- $1,781,670
- Gross receipts
- $6,425,376
- Employees
- 80
- Volunteers
- 20
- Year formed
- 1968
- State of legal domicile
- CO
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 October 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| CHRIS LANE | CEO Officer | 40 | $286,971 |
| CHRISTINA MAHON | EMPLOYEE Highest-paid employee | 40 | $128,926 |
| CLAYTON B KETTELKAMP | EMPLOYEE Highest-paid employee | 40 | $125,026 |
| ADAM LEWIS | TRUSTEE Trustee or director | 1 | $0 |
| ADELAIDE WATERS | TRUSTEE Trustee or director | 1 | $0 |
| ALEX SANCHEZ | TRUSTEE Trustee or director | 1 | $0 |
| ANDY DOCKEN | TRUSTEE Trustee or director | 1 | $0 |
| BARBARA ROSENBERG | TRUSTEE Trustee or director | 1 | $0 |
| BEN PRITZKER | TRUSTEE Trustee or director | 1 | $0 |
| BRIAN BRADY | TREASURER Trustee or director, Officer | 2 | $0 |
| CHRIS DANIELS | TRUSTEE Trustee or director | 1 | $0 |
| DIANE MOORE | CHAIR Trustee or director, Officer | 4 | $0 |
| GINA MURDOCK | TRUSTEE Trustee or director | 1 | $0 |
| HADLEY HENTSCHEL | TRUSTEE Trustee or director | 1 | $0 |
| JENNIFER GOLDFARB | TRUSTEE Trustee or director | 1 | $0 |
7 more people on this return
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| JERRY MURDOCK | TRUSTEE Trustee or director | 1 | $0 |
| JODY GURALNICK | TRUSTEE Trustee or director | 1 | $0 |
| LESLIE LAMONT | TRUSTEE Trustee or director | 1 | $0 |
| MARK HAMILTON | TRUSTEE Trustee or director | 1 | $0 |
| MEGAN TALARICO | TRUSTEE Trustee or director | 1 | $0 |
| REENIE KINNEY | TRUSTEE Trustee or director | 1 | $0 |
| TOMAKIN ARCHAMBAULT | TRUSTEE Trustee or director | 1 | $0 |
990 for the year ended October 31, 2024: 21 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| CHRIS LANE | CEO Officer | 40 | $265,215 | $23,078 |
| CHRISTINA MAHON | EMPLOYEE Highest-paid employee | 40 | $115,025 | $11,411 |
| CLAYTON B KETTELKAMP | EMPLOYEE Highest-paid employee | 40 | $110,242 | $11,382 |
| ADAM LEWIS | TRUSTEE Trustee or director | 1 | $0 | $0 |
| ADELAIDE WATERS | TRUSTEE Trustee or director | 1 | $0 | $0 |
| BRIAN BRADY | TREASURER Trustee or director, Officer | 2 | $0 | $0 |
| HADLEY HENTSCHEL | TRUSTEE Trustee or director | 1 | $0 | $0 |
| REENIE KINNEY | TRUSTEE Trustee or director | 1 | $0 | $0 |
| MARK HAMILTON | TRUSTEE Trustee or director | 1 | $0 | $0 |
| LESLIE LAMONT | TRUSTEE Trustee or director | 1 | $0 | $0 |
| JERRY MURDOCK | TRUSTEE Trustee or director | 1 | $0 | $0 |
| MEGAN TALARICO | TRUSTEE Trustee or director | 1 | $0 | $0 |
| JENNIFER GOLDFARB | TRUSTEE Trustee or director | 1 | $0 | $0 |
| DIANE MOORE | CHAIR Trustee or director, Officer | 4 | $0 | $0 |
| COLTER VAN DOMELEN | TRUSTEE Trustee or director | 1 | $0 | $0 |
| CHRIS DANIELS | TRUSTEE Trustee or director | 1 | $0 | $0 |
| BEN PRITZKER | TRUSTEE Trustee or director | 1 | $0 | $0 |
| BARBARA ROSENBERG | TRUSTEE Trustee or director | 1 | $0 | $0 |
| ANDY DOCKEN | TRUSTEE Trustee or director | 1 | $0 | $0 |
| ALEX SANCHEZ | TRUSTEE Trustee or director | 1 | $0 | $0 |
| GINA MURDOCK | TRUSTEE Trustee or director | 1 | $0 | $0 |
990 for the year ended October 31, 2023: 20 people
| Name | Title | Hours / week | Compensation | Other / benefits |
|---|---|---|---|---|
| CHRIS LANE | CEO Officer | 40 | $242,726 | $17,580 |
| CHRISTINA MAHON | EMPLOYEE Highest-paid employee | 40 | $107,647 | $0 |
| ADAM LEWIS | TRUSTEE Trustee or director | 1 | $0 | $0 |
| ALEX SANCHEZ | TRUSTEE Trustee or director | 1 | $0 | $0 |
| ANDY DOCKEN | TRUSTEE Trustee or director | 1 | $0 | $0 |
| BARBARA ROSENBERG | TRUSTEE Trustee or director | 1 | $0 | $0 |
| BEN PRITZKER | TRUSTEE Trustee or director | 1 | $0 | $0 |
| CHRIS DANIELS | TRUSTEE Trustee or director | 1 | $0 | $0 |
| COLTER VAN DOMELEN | TRUSTEE Trustee or director | 1 | $0 | $0 |
| DANIEL SHAW | CHAIR Trustee or director, Officer | 4 | $0 | $0 |
| DIANE MOORE | TRUSTEE Trustee or director | 1 | $0 | $0 |
| GINA MURDOCK | TRUSTEE Trustee or director | 1 | $0 | $0 |
| JENNIFER GOLDFARB | TRUSTEE Trustee or director | 1 | $0 | $0 |
| JERRY MURDOCK | TRUSTEE Trustee or director | 1 | $0 | $0 |
| LESLIE LAMONT | TRUSTEE Trustee or director | 1 | $0 | $0 |
| MARK HAMILTON | TRUSTEE Trustee or director | 1 | $0 | $0 |
| MAUREEN KINNEY | TRUSTEE Trustee or director | 1 | $0 | $0 |
| HADLEY HENTSCHEL | TRUSTEE Trustee or director | 1 | $0 | $0 |
| BRIAN BRADY | TREASURER Trustee or director, Officer | 1 | $0 | $0 |
| ADELAIDE WATERS | TRUSTEE Trustee or director | 1 | $0 | $0 |
Address and contacts
- Address (IRS master file)
- 100 PUPPY SMITH ST, ASPEN, CO 81611-1451
- Principal officer (990 for 2024)
- CHRIS LANE, 100 PUPPY SMITH ST, ASPEN, CO 81611
- Signed the 990
- CHRIS LANE, CEO
- Phone
- (970) 925-5756
- Website
- WWW.ASPENNATURE.ORG
- Return prepared by
- REESE HENRY & COMPANY INC
Mission
ACES' MISSION IS TO INSPIRE A LIFE-LONG COMMITMENT TO THE EARTH BY PROVIDING INNOVATIVE AND IMMERSIVE PROGRAMMING FOR ALL AGES.
Program accomplishments
- ASPEN CENTER FOR ENVIRONMENTAL STUDIES (ACES) IS A NONPROFIT ENVIRONMENTAL SCIENCE EDUCATION ORGANIZATION.ACES INSPIRES A LIFE-LONG COMMITMENT TO THE EARTH BY PROVIDING INNOVATIVE AND IMMERSIVE EDUCATIONAL PROGRAMMING FOR ALL AGES. WE HAVE THREE LOCATIONS: HALLAM LAKE, ROCK BOTTOM RANCH, AND CATTO CENTER AT TOKLAT. OUR EDUCATION PROGRAMS FOCUS ON ECOLOGICAL LITERACY, REGENERATIVE AGRICULTURE, FOREST AND ECOSYSTEM HEALTH, LAND RESTORATION, AND ENVIRONMENTAL CIVIC LEADERSHIP AND THEY REACH OVER 140,000 INDIVIDUALS EVERY YEAR. IN PARTNERSHIP WITH 60 PLUS PARTNER ORGANIZATIONS, ACES TEACHES ENVIRONMENTAL SCIENCE DAILY IN SCHOOLS FROM ASPEN TO RIFLE COLORADO, PROVIDES DAY CAMPS FOR CHILDREN IN THE SUMMER AND OVER SELECT HOLIDAYS, GUIDES ADULTS AND YOUTHS OF ALL AGES ON OUTDOOR NATURE CLASSES, GUIDED HIKES AND FIELD PROGRAMS. WE ALSO ENGAGE OUR COMMUNITY BY HOSTING PUBLIC LECTURES AND EVENTS ABOUT CUTTING EDGE ENVIRONMENTAL SCIENCE. THROUGH COLLABORATIONS WITH LAND TRUSTS, PUBLIC AGENCIES AND OTHER NONPROFIT ORGANIZATIONS; ACES CARRIES OUT ITS MISSION "EDUCATING FOR ENVIRONMENTAL RESPONSIBILITY."Expenses $3,687,710 · revenue $1,214,323
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 October, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2024 | October 31, 2025 | March 16, 2026 | 990 on file |
| 2023 | October 31, 2024 | March 17, 2025 | 990 on file |
| 2022 | October 31, 2023 | March 15, 2024 | 990 on file |
IRS record
- EIN
- 23-7042291
- 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
- 1969
- Accounting year ends
- October
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Environment (C600)
- Assets (IRS master file)
- $39,643,797
- Income (IRS master file)
- $6,425,376
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | October 2025 | $6,250,553 | $5,018,774 | $39,643,797 | XML |
| 990 | October 2024 | $5,880,494 | $4,211,814 | $38,720,736 | XML |
| 990 | October 2023 | $5,628,622 | $3,964,246 | $36,862,201 | XML |
| 990 | October 2022 | $4,526,369 | $3,211,488 | $34,082,022 | IRS |
| 990 | October 2021 | – | – | – | IRS |
| 990 | October 2020 | – | – | – | IRS |
| 990 | October 2019 | – | – | – | IRS |
| 990 | October 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 23-7042291).
Questions about ASPEN CENTER FOR ENVIRONMENTAL STUDIES
- What is the EIN of ASPEN CENTER FOR ENVIRONMENTAL STUDIES?
- The employer identification number (EIN) of ASPEN CENTER FOR ENVIRONMENTAL STUDIES is 23-7042291.
- Is ASPEN CENTER FOR ENVIRONMENTAL STUDIES tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1969.
- Are donations to ASPEN CENTER FOR ENVIRONMENTAL STUDIES tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does ASPEN CENTER FOR ENVIRONMENTAL STUDIES 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 ASPEN CENTER FOR ENVIRONMENTAL STUDIES due?
- The return for tax year 2025 (the year ending October 31, 2026) is due March 15, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did ASPEN CENTER FOR ENVIRONMENTAL STUDIES last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended October 2025.
- Who is the principal officer of ASPEN CENTER FOR ENVIRONMENTAL STUDIES?
- The 990 for the year ended October 31, 2025 names CHRIS LANE.
- Who are the officers and directors of ASPEN CENTER FOR ENVIRONMENTAL STUDIES?
- The 990 for the year ended October 31, 2025 lists 22 people; 3 received compensation from the organization, the highest $286,971 (CHRIS LANE, CEO).
- How much revenue does ASPEN CENTER FOR ENVIRONMENTAL STUDIES have?
- On its 990 for the year ended October 31, 2025 it reported revenue of $6,250,553, expenses of $5,018,774 and total assets of $39,643,797 at year end.
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