Jakarta International School was founded by UN workers in 1951. These pioneers introduced relevant schooling in English for children of expats in the newfound Republic of Indonesia. From early days the school's international identity was clear. It was originally named the Joint Embassy School (J.E.S.) after its British, American, Australian and (then) Yugoslavian embassy partners. Just over a decade later, in 1978, J.E.S. became J.I.S.