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Contact Information

Ontario High School
(909) 988-7411
7:00am - 3:30pm  M-F

Administration Office

Ontario High School Administration

Mr. Eduardo Zaldivar
Cinde Diederich, Administrative Secretary


Mrs. Jessica Kachaenchai
Assistant Principal Instruction
Lianne Andrade, Instruction Secretary
Dr. Lino Gomez-Cerrillo
Assistant Principal of Achievement
Janette Martin, Achievement Secretary


Mr. Ryan Alvarez
Assistant Principal of Educational Services
Shira Morales, Educational Services Secretary


Mr. Jean-Charles Placide
Assistant Principal of Discipline
Jenny Sunderland, Discipline Secretary

Contact Us

Alvarez, Ryan (909) 988-7411 ex.2026 Assistant Principal Ed Services
Andrade, Lianne (909) 988-7411 ex.2023 Instruction Secretary
Diederich, Cinde (909) 988-7411 ex.2021 Administrative Secretary
Gomez-Cerrillo, Lino (909) 988-7411 ex.2024 Assistant Principal of Achievement
Kachaenchai, Jessica (909) 988-7411 ex.2022 Assistant Principal of Instruction
Morales, Shira (909) 988-7411 ex.2027 Ed Services Secretary
Placide, Jean-Charles (909) 988-7411 ex.2030 Assistant Principal of Discipline
Zaldivar, Eduardo (909) 988-7411 ex.2020 Principal