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NATURAL HISTORY INSTITUTE

EIN 82-1871782 PRESCOTT, AZ

Largest nonprofits in Arizona

Revenue 2024
$391,197
Expenses 2024
$381,157

Program services were 62.2% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

As filed

Subsection
03
NTEE code
A54
Classification
2000
Street
126 N MARINA ST

These codes are the IRS's own and are shown exactly as filed. What each one means is in the Business Master File documentation (opens in a new tab).

Other organizations at this address

1 other organization in the IRS Business Master File lists the same street address. matched by us

We match the street line and ZIP code as the IRS gives them, ignoring case and outer spaces and nothing else, so "AVE" and "AVENUE" count as different streets and this list can miss some. A shared address can mean related organizations or a shared office, but it can also be a registered agent, a mail drop or a service provider holding mail for unrelated clients. It is not, by itself, evidence that two organizations are connected.

Mission and programs · 2024

Mission

Natural History Institute is organized to provide leadership and resources for a revitalized practice of natural history that integrates art, science, and humanities to promote the health and well-being of humans and the rest of the natural world.

  • Community Nature Education Inspiring Stewardship Through LearningThis program advances NHI's mission by connecting people with nature through hands-on experiences and expert-led lectures. In 2024, the Speaker Series and community workshops served 533 individuals through 38 programs, with a total in-person attendance of 1,888, including adults, senior citizens, and 2 lifelong learners. Activities included in-person talks, field studies, and interactive workshops designed to foster environmental literacy and inspire stewardship of the Mogollon Highlands. Each presentation was live-streamed and recorded, reaching a national audience with 91,300 views on YouTube.

    Expenses $229,545 · Revenue $60,435

  • Art Gallery and Exhibitions Blending Art and NatureThe NHI Art Gallery presented four free contemporary exhibitions in 2024, each featuring one public artist talk and one hands-on workshop. 4th Friday Art Walks provided additional opportunities for the public to meet artists and engage with artwork. Open five days a week, the gallery attracts hundreds of visitors and integrates artistic and scientific perspectives to educate the public about regional ecology and culture, providing free access to high-quality exhibitions and creative experiences.

    Expenses $4,679 · Revenue $5,068

  • Mogollon Highlands Science Initiative Research, Collections, and ConservationThis initiative advances scientific understanding and conservation of the Mogollon Highlands ecoregion. In 2024, NHI conducted research, educational programming, and community engagement around the Wild and Scenic Upper Verde River, Walnut Creek Center for Education and Research, and other critical habitats. Activities included field studies, ecological monitoring, and scientific collections. The initiativepromotes evidence-based stewardship and long-term protection of regional ecosystems.

    Expenses $2,760

  • Other Program Services Nature Nios CollaborationNHI participated in 12 Nature Nios events, a community collaboration providing free nature education to children and families.

As filed on the 2024 return. The filer continues this part on Schedule O, which is not shown here.

Officers and directors · 2024

As listed in Part VII of the 2024 return, in the order the filer printed them. Each return names its own; this is not a roster the organization keeps with us.

  • Robert Ellis

    Executive Dir.

    Total calculated
    $99,876
    From this org
    $93,569
    From related orgs
    $0
    Other
    $6,307
    Hours/week
    40
  • Ty Fitzmorris

    Treasurer

    Total calculated
    $0
    Hours/week
    1
  • Earl Duque

    Trustee

    Total calculated
    $0
    Hours/week
    1
  • Reuben Ellis

    Secretary

    Total calculated
    $0
    Hours/week
    2
  • John Farmer

    Vice President

    Total calculated
    $0
    Hours/week
    1
  • Rebecca Ruffner

    President

    Total calculated
    $0
    Hours/week
    2
  • Bob Gessner

    Trustee

    Total calculated
    $0
    Hours/week
    1
  • Rebecca Horniman

    Trustee

    Total calculated
    $0
    Hours/week
    1

Compensation is as filed in Part VII: reportable pay from this organization and from related organizations, other compensation, and hours per week. The total, marked calculated, is our sum of the three dollar columns, with a blank column counted as $0; the form itself has no total. On a Form 990-EZ the columns are Part IV's instead, and on a Form 990-PF Part VIII's — compensation, contributions to benefit plans, and expense account — and the total sums those. Earlier years are each on their own filing page.

Filings

  • 2024
    Revenue
    $391,197
    Expenses
    $381,157
    Contributions
    $326,488
    Grants paid
    $0
  • 2023
    Revenue
    $370,062
    Expenses
    $425,822
    Contributions
    $328,212
    Grants paid
    $0
  • 2022
    Revenue
    $164,365
    Expenses
    $375,299
    Contributions
    $132,668
    Grants paid
    $0
  • 2022
    Revenue
    $164,365
    Expenses
    $375,299
    Contributions
    $132,668
    Grants paid
    $0

The four totals the IRS asks for on Part I of the Form 990, as filed. A dash means the figure was not present on the return — not that it was zero.

Other returns filed

  • 2021 · 990

    Revenue
    $365,707
    Expenses
    $333,525
    Assets (EOY)
    $348,554
  • 2020 · 990

    Revenue
    $381,485
    Expenses
    $344,933
    Assets (EOY)
    $315,044
  • 2020 · 990

    Revenue
    $381,485
    Expenses
    $344,933
    Assets (EOY)
    $261,694
  • 2019 · 990

    Revenue
    $531,720
    Expenses
    $432,237
    Assets (EOY)
    $224,515
  • 2019 · 990

    Revenue
    $585,070
    Expenses
    $432,237
    Assets (EOY)
    $277,865
  • 2018 · 990

    Revenue
    $461,343
    Expenses
    $415,549
    Assets (EOY)
    $125,218

Nonprofiteer parses Forms 990, 990-EZ and 990-PF, in a window of recent tax years. These returns are recorded from the IRS e-file index, so their figures were extracted by that index rather than read from the return here — treat them as a different source from the filings above, not as more of the same record. A dash means the index carries no figure; Form 990-T listings carry none at all.

Grants made

No itemized grants to organizations. Schedule I is filed only by organizations that granted more than $5,000 to a recipient, so most filers have none.

Grants received

Other IRS files

Auto-Revocation List

Not listed. The IRS publishes this list for organizations whose exemption was automatically revoked for failing to file for three consecutive years.

Publication 78

Listed as of 13 October 2026, under deductibility PC.

These are two separate IRS files on two separate schedules, shown as published and not reconciled with each other. Neither is a statement about whether a contribution is deductible today: 19,245 organizations appear in Publication 78 while the IRS's own revocation file lists them as currently revoked, more than half of those revoked before 2019. Absence from Publication 78 is evidence of nothing, and presence is not evidence either. Verify current status with the IRS before relying on it.

What this page reflects

The registration facts above come from the IRS Business Master File published 13 October 2026 and read 1 November 2026, for every organization at once. Returns through tax year 2024, the newest we have parsed for this organization.