Mathilda-Marks Kennedy, Simon Marks and Rosh Pinah already operate with a similar religious ethos to US schools as they are under the authority of the Chief Rabbi.

The tie-up with the US will make no difference to their admissions policies.

Stephen Pack, US president, said he was excited by the “fantastic addition to the US family. Education is a key priority for the US.”

Peter Ohrenstein, Scopus chairman, said “the US expertise and resources will ensure the continuity of an excellent Jewish education for future generations”.

Andrew Rotenberg, chairman of governors of Rosh Pinah, said that he believed the link would be “of great benefit” to his school.

“Although there will be no effect in the day-to-day running and operational management of the school,” he added, “by having a more formal association with the United Synagogue, we will be able to access and take advantage of the expertise, knowledge, experience and resources of their schools team and affiliated departments.”

The trustees of the US have become trustees of Scopus, which was founded 60 years ago as the Zionist Federation Educational Trust.