The school was established in 1995 by a group of international parents (mainly diplomats and business people)[2] keen to improve the quality of education for their children.

In February 2022, PSI had to close its campus in Kyiv due to the full-scale war in Ukraine.

By August 2022, PSI adapted by opening a temporary satellite campus in Warsaw, Poland, in partnership with the American School of Warsaw (ASW), while also offering online learning in collaboration with Avenues Online for students still in Ukraine.

[9] In the spring of 2023, PSI's accreditation status was renewed by NEASC and IB through the Collaborative Learning Protocol process.

[10] PSI has been accredited by the New England Association of Schools & Colleges[11] (NEASC) in 2002 and received the most recent re-accreditation status in spring 2023.

Seventy-seven percent of the faculty hold postgraduate degrees, and the international teaching staff comprises about 60% of the total team.

[13][14][15] The educational programs cover the learning and development process for students aged 3 to 19 and include: The IB diploma provides opportunities for higher education and is accepted and recognized by more than 2,337 universities in 90 countries around the world.

[18] Due to the war in Ukraine, the 2022 – 2023 academic year will find PSI provided in-person instruction to its students at a satellite campus in Warsaw, Poland[19] as well as online instruction for its students living abroad.

There is also an established alumni association, which holds reunions for former students and staff members both face-to-face and virtually.