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US nonprofit · EIN 341869716 · Cleveland, OHiSource and licenceOrganisation record IRS Exempt Organizations Business Master File (EIN 341869716) - 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 tenure.Latest return IRS Form 990 series e-file data - 990 for the year to 30 June 2025: assets, liabilities, staff, website, telephone, pay.Renewal outlook Computed by Governance Register from the observed filing history and filed revenue (us-approach-v4-clean). 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

Horizon Educational Services Inc

Donations deductible
Revenue
$5.6m
year to 30 June 2025
Expenses
$4.7m
year to 30 June 2025
Total assets
$8.4m
$4.9m liabilities
Net assets
$3.6m
assets less liabilities
Directors and trustees
5
5.8y av
Staff
38
employees, year to 30 June 2025
Left since last filing
0
no seats appear to have opened
Officers and senior staff
2
named in Part VII
How am I connected?

Horizon Educational Services Inc's network

5 people4 organisationsi5 people and 4 organisations on this map.The large node is the subject of this page. Solid lines are what the register itself records (5). Violet dotted lines (17) 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

5 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.Tenure and departures are observed across annual filings. Observed tenure is a lower bound - a member may have joined before the first year on record. The organisation reported 5 voting members of its governing body on its latest Form 990 Part VI, which matches the board listed here.
NameRole as filedSinceOn the board
Abdullah KayretliBoard Member2021
5 yrs
Donald MalloyBoard President2019
7 yrs
Marie BonillaBoard Member2020
6 yrs
Mustafa ArslanBoard Member2022
4 yrs
Robert HassanBoard Member2021
5 yrs
Under 5 years5 to 6 years6 years or more

Officers and senior leadership

2 listediNamed in Part VII as officers, key employees or highest-compensated staff - not board members, shown for completeness.
NameTitle as filedOn the filings
Aydin KaraSchool Principal2020
Mehmet GurbuzSchool Principal2019

Pay and hours

year to 30 June 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
Megan McKinley-NagelskiSchool Principal40$85k
Caglar GulerBoard Member1$0
Mustafa ArslanBoard Member1$0
Marie BonillaBoard Member1$0
Donald MalloyBoard President1$0
Robert HassanBoard Member1$0

About

Legal name
Horizon Educational Services Inc
EIN
341869716
Address
6000 S Marginal Rd, Cleveland, OH, 44103-1042
State
Ohio
Mission
Horizon Science Academy Cleveland High School is a public charter school that serving grades 9-12 for children in Cleveland, OH. The school is a college prep school focusing on math, science and technology education. (as filed on the Form 990)
Activity (NTEE)
B25 Education
IRS classification
501(c)03 (tax-exempt under section 501(c)(3) where shown)
Classified purpose
Education
Size band
7 (IRS master file code)
Formed
1998
Principal officer
Ramazan Celep (as named on the Form 990)
IRS ruling date
1 January 1999
Status
Code 01 (unconditional exemption)
Form 990 filings on record
5, latest 2023
IRS Publication 78
PC (contributions deductible)

Most connected

Longest observed on the filings

≥7years on the filingsDonald Malloy
≥6years on the filingsMarie Bonilla
≥5years on the filingsAbdullah Kayretli
≥5years on the filingsRobert Hassan

Latest return

year to 30 June 2025iFigures from the newest Form 990 or 990-EZ in the IRS e-file releases of 2025 and 2026, for the year ending 30 June 2025. US dollars, as filed.
Total assets
$8.4m
Total liabilities
$4.9m
Net assets or fund balances
$3.6m
Contributions and grants received
$4.8m
Program service revenue
$0
Employees
38