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PLANETARY SCIENCE INSTITUTE

EIN 33-0175263 TUCSON, AZ

Revenue 2024
$17,044,515
Expenses 2024
$17,282,384

Program services were 89.1% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

As filed

Subsection
03
Classification
1000
Street
1700 E FORT LOWELL RD STE 106

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).

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.

  • Mark V Sykes

    CEO / Trustee (through April 2025)

    Total calculated
    $295,943
    From this org
    $251,399
    From related orgs
    $0
    Other
    $44,544
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $249,295
    Bonus
    $0
    Other
    $2,104
    Deferred
    $34,877
    Nontaxable benefits
    $9,667
    Filer's total
    $295,943

  • Amanda R Hendrix

    CEO / Trustee (effective May 2025)

    Total calculated
    $207,449
    From this org
    $165,502
    From related orgs
    $0
    Other
    $41,947
    Hours/week
    35

    Schedule J breakdown matched by us

    Base
    $163,531
    Bonus
    $681
    Other
    $1,290
    Deferred
    $22,942
    Nontaxable benefits
    $19,005
    Filer's total
    $207,449

  • Scott Fouse

    Trustee/Board Chair

    Total calculated
    $0
    Hours/week
    5

  • William Craig

    Trustee/Vice Chair

    Total calculated
    $0
    Hours/week
    5

  • William Hartmann

    Trustee

    Total calculated
    $0
    Hours/week
    5

  • Alison Nordt

    Trustee

    Total calculated
    $0
    Hours/week
    5

  • Arun Seraphin

    Trustee

    Total calculated
    $0
    Hours/week
    5

  • Dan Dumbacher

    Trustee

    Total calculated
    $0
    Hours/week
    5

  • Maurizio A Ienna-Balistreri

    CFO / Treasurer

    Total calculated
    $237,409
    From this org
    $186,274
    From related orgs
    $0
    Other
    $51,135
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $185,974
    Bonus
    $0
    Other
    $300
    Deferred
    $25,973
    Nontaxable benefits
    $25,162
    Filer's total
    $237,409

  • Linda L Rueger

    HR Director / Secretary

    Total calculated
    $186,137
    From this org
    $155,078
    From related orgs
    $0
    Other
    $31,059
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $149,974
    Bonus
    $3,000
    Other
    $2,104
    Deferred
    $21,392
    Nontaxable benefits
    $9,667
    Filer's total
    $186,137

  • Melinda Dyar

    Senior Scientist

    Total calculated
    $275,470
    From this org
    $241,888
    From related orgs
    $0
    Other
    $33,582
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $239,869
    Bonus
    $0
    Other
    $2,019
    Deferred
    $33,582
    Nontaxable benefits
    $0
    Filer's total
    $275,470

  • Nathaniel Putzig

    Senior Scientist

    Total calculated
    $223,226
    From this org
    $182,127
    From related orgs
    $0
    Other
    $41,099
    Hours/week
    39

    Schedule J breakdown matched by us

    Base
    $180,147
    Bonus
    $0
    Other
    $1,980
    Deferred
    $25,180
    Nontaxable benefits
    $15,919
    Filer's total
    $223,226

  • Rebecca M Williams

    Senior Scientist

    Total calculated
    $199,052
    From this org
    $174,692
    From related orgs
    $0
    Other
    $24,360
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $174,002
    Bonus
    $0
    Other
    $690
    Deferred
    $24,360
    Nontaxable benefits
    $0
    Filer's total
    $199,052

  • Jonathan M Lilly

    Senior Scientist

    Total calculated
    $209,657
    From this org
    $183,994
    From related orgs
    $0
    Other
    $25,663
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $183,304
    Bonus
    $0
    Other
    $690
    Deferred
    $25,663
    Nontaxable benefits
    $0
    Filer's total
    $209,657

  • Eldar Z Noe Dobrea

    Senior Scientist

    Total calculated
    $208,885
    From this org
    $176,641
    From related orgs
    $0
    Other
    $32,244
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $176,191
    Bonus
    $0
    Other
    $450
    Deferred
    $24,648
    Nontaxable benefits
    $7,596
    Filer's total
    $208,885

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. A Schedule J breakdown is as filed: base pay, bonus, other, deferred compensation and nontaxable benefits from this organization, with any from related organizations beside each, and the filer's own total. It is shown with the Part VII listing of the same name on the same return. The form gives no key between the two, so that pairing is ours, and is marked matched by us. Earlier years are each on their own filing page.

Filings

  • 2024
    Revenue
    $17,044,515
    Expenses
    $17,282,384
    Contributions
    $116,313
    Grants paid
    $0
  • 2023
    Revenue
    $17,875,430
    Expenses
    $17,793,247
    Contributions
    $127,528
    Grants paid
    $0
  • 2022
    Revenue
    $17,937,228
    Expenses
    $17,620,401
    Contributions
    $121,858
    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
    $18,517,420
    Expenses
    $18,151,737
    Assets (EOY)
    $5,887,452

  • 2020 · 990

    Revenue
    $17,303,405
    Expenses
    $15,454,007
    Assets (EOY)
    $5,275,095

  • 2019 · 990

    Revenue
    $15,041,893
    Expenses
    $15,120,352
    Assets (EOY)
    $5,644,697

  • 2018 · 990

    Revenue
    $15,198,856
    Expenses
    $15,027,290
    Assets (EOY)
    $3,624,539

  • 2017 · 990

    Revenue
    $13,124,044
    Expenses
    $12,945,376
    Assets (EOY)
    $3,358,331

  • 2016 · 990

    Revenue
    $12,104,463
    Expenses
    $12,020,299
    Assets (EOY)
    $2,932,492

  • 2015 · 990

    Revenue
    $11,666,276
    Expenses
    $11,687,626
    Assets (EOY)
    $2,917,293

  • 2014 · 990

    Revenue
    $10,662,768
    Expenses
    $10,550,240
    Assets (EOY)
    $2,913,855

  • 2013 · 990

    Revenue
    $9,816,547
    Expenses
    $9,800,201
    Assets (EOY)
    $2,790,212

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

The 10 largest by cash amount. The API serves every itemized grant.

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 23 October 2026, for every organization at once. Returns through tax year 2024, the newest we have parsed for this organization.