Early Days The International School of Kenya's origins date to 1967 when Nancy Ellen Crooks opened the American Community School with 30 children in a home near the
Nairobi Hospital. Crooks became the first principal. Three years later, in 1970, the
United States International University (USIU) acquired the school and relocated it to its current site on the former coffee plantation with a white wooden house and two stone buildings located at the end of Peponi Road. They renamed it Nairobi International School (NIS). Under USIU leadership, the school expanded grade offerings and even introduced university level courses. The campus pool was constructed in 1978. This major change on campus was soon followed by new state-of-the-art elementary classrooms opened in 2015.
Finances: tuition, scholarships, taxes ISK's high tuition is the subject of annual news reports. In 2024, annual tuition for pre-kindergarten pupils was US $18,500 (KSh 2.38 million) and US $36,600 (KSh 4.72 million) for grades 11-12. ISK also offers annual scholarships covering 100% of high school tuition for Kenyan citizens based on merit and financial need. ISK finances have undergone scrutiny. In 2021, the
Kenya Revenue Authority won 1.4 billion Kenyan shillings from the school in unpaid taxes from teacher salaries since 2016. In 2023, Katherine Musee, a former teacher, sued the school over alleged pay inequalities and separate payrolls between
expatriate teachers and local teachers. ==Notable individuals==