Matthew Slater, the headteacher of Kantor King Solomon High School in Redbridge, has left the school after an absence of seven months.
Parents were told that he had decided to go for “personal reasons” in a letter from the chairmen of the governors, Stephanie Sollosi and Richard Burack.
It gave no other detail and offered no comment on Mr Slater’s contribution to the school, which he joined as head teacher in 2015.
But the governors passed on his thanks to “all the KKSHS staff, parents, carers and students for making his time at the school so enjoyable and for the roles they all played in making KKSHS the fabulous and warm school it is today”.