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GMTO CORPORATION

EIN 26-2637707 PASADENA, CA

Browse the largest nonprofits in California

Revenue 2023
$21,214,460
Expenses 2023
$46,043,471

Program services were 79.3% of total expenses calculated — Part IX's program-services column over total expenses, both as filed.

As filed

Subsection
03
NTEE code
U31
Classification
2100
Street
300 N LAKE AVE FL 14

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).

Mission and programs · 2023

Mission

GMTO CORPORATION IS A COLLABORATIVE EFFORT BETWEEN UNIVERSITIES AND RESEARCH INSTITUTIONS TO BUILD A NEXT GENERATION EXTREMELY LARGE TELESCOPE FOR ASTRONOMICAL RESEARCH.

Activities or mission (Part I)

UNDERTAKE DESIGN, DEVELOPMENT, CONSTRUCTION & OPERATION OF THE GIANT MAGELLAN TELESCOPE.

  • THE PURPOSE OF THE CORPORATION IS TO UNDERTAKE THE DESIGN, DEVELOPMENT, CONSTRUCTION AND OPERATION OF THE GIANT MAGELLAN TELESCOPE ("GMT"), A STATE-OF-THE-ART NEXT GENERATION ASTRONOMICAL TELESCOPE, AS A COLLABORATIVE EFFORT BETWEEN UNIVERSITIES AND RESEARCH ORGANIZATIONS. ALL CONTRIBUTIONS AND ALL EXPENSES ARE GEARED TOWARD THE FULFILLMENT OF THAT PURPOSE. DURING THE FISCAL YEAR ENDING JUNE 30, 2024, GMTO CONTINUED ON THE WORK ON ITS PRIMARY MIRROR SEGMENTS AND DESIGN WORK ON MAJOR SUBSYSTEMS, INCLUDING PROTOTYPING, AND UNDERWENT VARIOUS DESIGN REVIEWS.

    Expenses $36,535,321

As filed on the 2023 return.

Officers and directors · 2023

As listed in Part VII of the 2023 return, in the order the filer printed them. Each return names its own; this is not a roster the organization keeps with us.

  • Walter Massey

    CHAIR, BOARD OF DIRECTORS

    Total calculated
    $0
    Hours/week
    1
  • Taft Armandroff

    VICE CHAIR, BOARD OF DIRECTORS

    Total calculated
    $0
    Hours/week
    1
  • Wayne Alexander

    BOARD MEMBER

    Total calculated
    $0
    Hours/week
    1
  • John Arnold

    BOARD MEMBER (FROM 2/24)

    Total calculated
    $0
    Hours/week
    1
  • Jack Baldauf

    BOARD MEMBER

    Total calculated
    $0
    Hours/week
    1
  • Buell Jannuzi

    BOARD MEMBER

    Total calculated
    $0
    Hours/week
    1
  • Lisa Kewley

    BOARD MEMBER

    Total calculated
    $0
    Hours/week
    1
  • John Mulchaey

    BOARD MEMBER

    Total calculated
    $0
    Hours/week
    1
  • Byeong-Gon Park

    BOARD MEMBER

    Total calculated
    $0
    Hours/week
    1
  • Chan Park

    BOARD MEMBER (FROM 10/23)

    Total calculated
    $0
    Hours/week
    1
  • Sung Hyun Park

    BOARD MEMBER (THRU 10/23)

    Total calculated
    $0
    Hours/week
    1
  • Sarah Pearce

    BOARD MEMBER

    Total calculated
    $0
    Hours/week
    1
  • Joaquin Ruiz

    BOARD MEMBER (THRU 10/23)

    Total calculated
    $0
    Hours/week
    1
  • Vitor De Souza

    BOARD MEMBER (FROM 2/24)

    Total calculated
    $0
    Hours/week
    1
  • Randy Stringer

    BOARD MEMBER

    Total calculated
    $0
    Hours/week
    1
  • Chris Tinney

    BOARD MEMBER

    Total calculated
    $0
    Hours/week
    1
  • Robert Shelton

    PRESIDENT

    Total calculated
    $591,548
    From this org
    $506,774
    From related orgs
    $0
    Other
    $84,774
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $506,774
    Bonus
    $0
    Other
    $0
    Deferred
    $66,000
    Nontaxable benefits
    $18,774
    Filer's total
    $591,548
  • Alan Gordon

    CFO & VP OF BUSINESS OPERATIONS

    Total calculated
    $362,318
    From this org
    $277,861
    From related orgs
    $0
    Other
    $84,457
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $277,861
    Bonus
    $0
    Other
    $0
    Deferred
    $55,890
    Nontaxable benefits
    $28,567
    Filer's total
    $362,318
  • Kevin Mills

    VP FOR LEGAL AFFAIRS & GEN. COUNSEL

    Total calculated
    $265,782
    From this org
    $204,033
    From related orgs
    $0
    Other
    $61,749
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $204,033
    Bonus
    $0
    Other
    $0
    Deferred
    $36,463
    Nontaxable benefits
    $25,286
    Filer's total
    $265,782
  • William Burgett

    PROJECT MANAGER

    Total calculated
    $367,666
    From this org
    $298,986
    From related orgs
    $0
    Other
    $68,680
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $298,986
    Bonus
    $0
    Other
    $0
    Deferred
    $56,606
    Nontaxable benefits
    $12,074
    Filer's total
    $367,666
  • Glenn Brossus

    DEPUTY PROJECT MANAGER

    Total calculated
    $347,393
    From this org
    $257,772
    From related orgs
    $0
    Other
    $89,621
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $257,772
    Bonus
    $0
    Other
    $0
    Deferred
    $50,742
    Nontaxable benefits
    $38,879
    Filer's total
    $347,393
  • Rebecca Bernstein

    PROJECT SCIENTIST

    Total calculated
    $371,501
    From this org
    $304,380
    From related orgs
    $0
    Other
    $67,121
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $304,380
    Bonus
    $0
    Other
    $0
    Deferred
    $51,392
    Nontaxable benefits
    $15,729
    Filer's total
    $371,501
  • Frank Groark

    DEPUTY OPT. & OPTICAL METROLOGY MGR.

    Total calculated
    $331,783
    From this org
    $247,134
    From related orgs
    $0
    Other
    $84,649
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $247,134
    Bonus
    $0
    Other
    $0
    Deferred
    $50,965
    Nontaxable benefits
    $33,684
    Filer's total
    $331,783
  • Richard Demers

    WAVEFRONT SENSING & CONTROL MANAGER

    Total calculated
    $313,600
    From this org
    $251,954
    From related orgs
    $0
    Other
    $61,646
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $251,954
    Bonus
    $0
    Other
    $0
    Deferred
    $49,572
    Nontaxable benefits
    $12,074
    Filer's total
    $313,600
  • Bruce Bigelow

    SITE, ENCLOSURE, FACILITIES MGR

    Total calculated
    $307,630
    From this org
    $246,956
    From related orgs
    $0
    Other
    $60,674
    Hours/week
    40

    Schedule J breakdown matched by us

    Base
    $246,956
    Bonus
    $0
    Other
    $0
    Deferred
    $48,600
    Nontaxable benefits
    $12,074
    Filer's total
    $307,630

The first 25 listed. 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

  • 2023
    Revenue
    $21,214,460
    Expenses
    $46,043,471
    Contributions
    $19,984,346
    Grants paid
    $0
  • 2022
    Revenue
    $194,662,618
    Expenses
    $36,380,093
    Contributions
    $193,810,505
    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
    $32,220,104
    Expenses
    $37,165,448
    Assets (EOY)
    $321,703,747
  • 2020 · 990

    Revenue
    $8,771,769
    Expenses
    $34,752,653
    Assets (EOY)
    $305,649,164
  • 2019 · 990

    Revenue
    $4,199,536
    Expenses
    $40,709,497
    Assets (EOY)
    $330,327,152
  • 2018 · 990

    Revenue
    $40,599,120
    Expenses
    $39,820,884
    Assets (EOY)
    $367,820,702
  • 2017 · 990

    Revenue
    $10,946,024
    Expenses
    $38,930,666
    Assets (EOY)
    $365,009,321
  • 2016 · 990

    Revenue
    $5,515,656
    Expenses
    $28,509,469
    Assets (EOY)
    $387,702,781
  • 2015 · 990

    Revenue
    $2,528,643
    Expenses
    $34,995,896
    Assets (EOY)
    $411,816,468
  • 2014 · 990

    Revenue
    $347,399,787
    Expenses
    $16,606,973
    Assets (EOY)
    $440,351,720
  • 2013 · 990

    Revenue
    $27,792,782
    Expenses
    $11,026,348
    Assets (EOY)
    $107,563,164
  • 2012 · 990

    Revenue
    not reported
    Expenses
    $13,476,297
    Assets (EOY)
    $89,204,406

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. Showing the 10 most recent; the API carries the rest.

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 2023, the newest we have parsed for this organization.