Matthew Slater, the headteacher of Kantor King Solomon High School in Redbridge, has been absent from the school since early this month.
In a letter sent to parents on the eve of Succot, the chairmen of governors, Stephanie Sollosi and Richard Burack, said he was “on leave of absence for personal reasons and we hope you will understand that, at this time, it is not possible for the governing body to know when we expect his leave of absence to end”.
They promised to “keep you up to date as often as we can”.
Hannele Reece, the deputy head, has taken on the role as acting head in the meantime.