Seoul International School

A large American-curriculum K-12 school in Seongnam led by Dr Jim Gerhard, known for AP-heavy academics and one of the strongest US university admissions records of any school in Korea.

SIS was founded in 1973, holds WASC accreditation and offers more than 22 AP courses across 55 sections, including the AP Capstone Diploma. Fees sit at the top of the Seoul market at roughly 32 to 40 million won per year, comparable to SFS. The campus is on Seongnam-daero in Sujeong-gu, a commute out of central Seoul that families need to factor in.

SIS is academically rigorous and competitive, and the strongest college outcomes go to students who can keep up with the AP-heavy load. Families who want a lower-pressure environment, or whose children need more pastoral handholding, often land elsewhere. Where SFS leans Christian and IB, SIS leans US-curriculum and secular, which is a genuine point of difference for many families weighing the two. KIS Pangyo is the third school usually in the same conversation.

• Reputation online is sharply split between strong academic outcomes and serious management complaints. forum threads from prospective teachers repeatedly cite a long, widely circulated ISR review and parent fund protests, and several commenters say there are far better options in Seoul.
• Matriculation data circulated by parents online shows SIS sending a competitive number of students to Ivy League and other top US universities, in some years ahead of Seoul Foreign School. Strong AP and IB outcomes are the main reason the school keeps a tier-1 label in employment threads.
• The most detailed negative account, a long-form Reddit post from a former staffer, alleges high annual teacher turnover, retaliation against staff who raise concerns, parental-leave issues for women on staff, and a Staff Advisory Board described by the writer as 'smoke and mirrors'. The framing is whistleblower, not parent.
• A 2024 thread referenced an embezzlement controversy that prospective teachers continued to raise in 2024 and 2025 hiring discussions. Parents and teachers describe the issue as unresolved in public communication.
• Bilingual character is a recurring observation. Several Korean-American posters describe SIS students as using Korean heavily on campus, which families wanting a fully English-immersion experience treat as a negative and others treat as a fit consideration.
• A 2023 student post alleged peer harassment on an overnight Grade 8 trip. The post is uncorroborated and stands as a single account.