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US nonprofit · EIN 846029250 · Boulder, COiSource and licenceOrganisation record IRS Exempt Organizations Business Master File (EIN 846029250) - 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 time served.Latest return IRS Form 990 series e-file data - 990 for the year to 31 August 2025: assets, liabilities, staff, website, telephone, pay, grants paid (Schedule I).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. Not a statement that the organisation is recruiting.Deductibility IRS Publication 78 data (code PC), downloaded 18 October 2026.State registers Colorado Secretary of State (17 October 2026).Licence US Federal Government public domain.How we handle data

Thorne Ecological Institute

Donations deductible
Revenue
$2.7m
year to 31 August 2025
Expenses
$3.5m
year to 31 August 2025
Total assets
$7.4m
$1.5m liabilities
Net assets
$5.9m
assets less liabilities
Directors and trustees
15
3.6 years on average
Staff
82
207 volunteers
Chair observed
≥1 yr
John Ricotta
Left since last filing
4
27% of the board
How am I connected?

Thorne Ecological Institute's network

15 people2 organisationsi15 people and 2 organisations on this map.The large node is the subject of this page. Solid lines are what the register itself records (15). Violet dotted lines (2) 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

15 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, which matches the board listed here.
NameRole as filedSinceOn the board
John Ricotta ChairChair2024
2 yrs
Aidan SmithCompany secretary2025
1 yr
Annika ParadiseBoard Member2020
6 yrs
David KirkBoard Member2020
6 yrs
Jay SchultzBoard Member2025
1 yr
John AhrensBoard Member2021
5 yrs
Juana MendozaBoard Member2024
2 yrs
Leidy Pineda FloresBoard Member2024
2 yrs
Luis AlvarezBoard Member2022
4 yrs
Mary Kathryn WoodBoard Member2024
2 yrs
Micah ShagouryBoard Member2020
6 yrs
Sarah HauckVice Chair2022
4 yrs
Sarah IrizarryTreasurer2021
5 yrs
Sari LongBoard Member2025
1 yr
Tammy SandovalBoard Member2025
1 yr
Under 5 years5 to 6 years6 years or moreShow all 15 →

Officers and senior leadership

3 listediNamed in Part VII as officers, key employees or highest-compensated staff - not board members, shown for completeness.
NameTitle as filedOn the filings
Brian SenseExecutive Di2025
Keith DesrosiersExecutive Disince 2018
Leann ArendDeputy Direcsince 2024

Pay and hours

year to 31 August 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
Keith DesrosiersExecutive Di40$175k$18k
Leann ArendDeputy Direc40$115k
Brian SenseExecutive Di40$0
John RicottaChair2$0
Sarah HauckVice Chair2$0
Aidan SmithSecretary2$0
Sarah IrizarryTreasurer2$0
John AhrensBoard Member1$0
Luis AlvarezBoard Member1$0
David KirkBoard Member1$0
Sari LongBoard Member1$0
Juana MendozaBoard Member1$0
Annika ParadiseBoard Member1$0
Leidy Pineda FloresBoard Member1$0
Tammy SandovalBoard Member1$0
Jay SchultzBoard Member1$0
Micah ShagouryBoard Member1$0
Mary Kathryn WoodBoard Member1$0

Colorado roster

16 listediOfficers, directors and trustees from the latest filing with the Colorado Secretary of State (document 20263019351). Titles are as filed; some entries are registered agents or custodians of records rather than board members. Source: data.colorado.gov, public domain.
NameTitle as filed
Luis AlvarezMember
Juana MendozaMember
Aidan SmithVice-Chair
Kate Tillery-DanzerMember
Leidy Pineda FloresMember
Tammy SandovalMember
Sari LongSecretary
Sarah HauckMember
Juan MejiaMember
John RicottaChair
Mary Kathryn WoodMember
Jay SchultzTreasurer
Jill FrickerExecutive Director
Ricotta JohnChair
John AhrensMember
Deandrea Melissa

About

Legal name
Thorne Ecological Institute
EIN
846029250
Address
Po Box 19107, Boulder, CO, 80308-2107
State
Colorado
Mission
Thorne's mission is to build earth stewardship by connecting youth to nature through joyful, hands-on, place-based environmental education experiences. (as filed on the Form 990)
Activity (NTEE)
C60Z Environment
IRS classification
501(c)03 (tax-exempt under section 501(c)(3) where shown)
Classified purpose
Environment
Size band
7 (IRS master file code)
Formed
1954
Principal officer
Jill Fricker (as named on the Form 990)
IRS ruling date
1 October 1957
Status
Code 01 (unconditional exemption)
Form 990 filings on record
8, latest 2025
IRS Publication 78
PC (contributions deductible)

Most connected

Longest observed on the filings

≥6years on the filingsAnnika Paradise
≥6years on the filingsDavid Kirk
≥6years on the filingsMicah Shagoury
≥5years on the filingsJohn Ahrens

Latest return

year to 31 August 2025iFigures from the newest Form 990 or 990-EZ in the IRS e-file releases of 2025 and 2026, for the year ending 31 August 2025. US dollars, as filed.
Total assets
$7.4m
Total liabilities
$1.5m
Net assets or fund balances
$5.9m
Contributions and grants received
$1.3m
Program service revenue
$1.4m
Grants and similar paid out
$150k
Employees
82
Volunteers
207

Filed finances

1 yeariTotals as filed on the IRS Form 990 (revenue and expenses), by tax year.
Tax yearTotal revenueTotal expensesSurplus or deficit
2023$3.3m$3.6mDeficit $304k

As filed on the IRS Form 990. US dollars.

Grants paid

7 listediFrom Schedule I of the Form 990: grants and assistance to organisations in the United States, largest first (up to 25). Schedule I is filed only by organisations that gave more than $5,000 to any one recipient.
RecipientPurposeAmount
Cal-Wood Education CenterNature's kids$44k
Cottonwood InstituteNature's kids$32k
YMCA of Boulder ValleyNature's kids$22k
Wildlands Restoration VolunteersNature's kids$13k
Keystone Science SchoolNature's kids$11k
City of LongmontNature's kids$10k
Growing Gardens$7k

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.
Thorne Ecological Institute 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: Colorado Secretary of State (CDOS), business entities (data.colorado.gov 4ykn-tg5h). Licence: public domain. Data last fetched 18 October 2026.
State
Colorado
Entity type
nonprofit corporation
Status
Good Standing
Formed
18 December 1986
Registered agent
Thorne Ecological Institute (city and state not held)

This register does not publish officers or directors.