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Governance Register
US nonprofit · EIN 464683390 · Rancho Mirage, CAiSource and licenceOrganisation record IRS Exempt Organizations Business Master File (EIN 464683390) - 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 December 2024: assets, liabilities, staff, website, telephone, pay.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.Licence US Federal Government public domain.How we handle data

Sustainable Horizons Institute's network

4 peoplei4 people on this map.The large node is the subject of this page. Solid lines are what the register itself records (4). Form 990 filings give names without a person identifier; SEC insider filings carry a CIK.

The board

4 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.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 4 voting members of its governing body on its latest Form 990 Part VI, which matches the board listed here.
NameRole as filedSinceOn the board
David BrownDirector2023
3 yrs
John ZiebarthTreasurer2022
4 yrs
Mary Ann LeungPresident2018
8 yrs
Silvia CrivelliCompany secretary2022
4 yrs
Under 5 years5 to 6 years6 years or more

Officers and senior leadership

1 listediNamed in Part VII as officers, key employees or highest-compensated staff - not board members, shown for completeness.
NameTitle as filedOn the filings
Mary Ann LeungPresident2020

Pay and hours

year to 31 December 2024iFrom 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
Mary Ann LeungPresident40$257k$4k
John ZiebarthTreasurer1$11k
Silvia CrivelliSecretary0$0
David BrownDirector0$0

About

Legal name
Sustainable Horizons Institute
EIN
464683390
Address
Po Box 102, Rancho Mirage, CA, 92270-0102
State
California
Mission
Our mission is to build sustainable connections between students, faculty, and professionals in science, technology, engineering, and mathematics. Our approach is unique in two ways: 1 we devised and apply a model which addresses the development of the whole scientists through academic and mentoring support combined with career, professional, and leadership development and 2 we use proven... (as filed on the Form 990)
Activity (NTEE)
B99 Education
IRS classification
501(c)03 (tax-exempt under section 501(c)(3) where shown)
Classified purpose
Education
Size band
6 (IRS master file code)
IRS ruling date
1 July 2014
Status
Code 01 (unconditional exemption)
Form 990 filings on record
4, latest 2023
IRS Publication 78
PC (contributions deductible)

Most connected

Longest observed on the filings

≥8years on the filingsMary Ann Leung
≥4years on the filingsJohn Ziebarth
≥4years on the filingsSilvia Crivelli
≥3years on the filingsDavid Brown

Latest return

year to 31 December 2024iFigures from the newest Form 990 or 990-EZ in the IRS e-file releases of 2025 and 2026, for the year ending 31 December 2024. US dollars, as filed.
Total assets
$2.3m
Total liabilities
$173k
Net assets or fund balances
$2.2m
Contributions and grants received
$409k
Program service revenue
$642k
Employees
8
Volunteers
40