Deborah Lipkin, the executive headteacher of JFS, is to leave at the end of term, parents have been told.
Ms Lipkin, a turnaround specialist, was drafted in last year to improve the fortunes of the school after a critical Ofsted report.
Geraldine Fainer, the chairman of governors, said: “As most of you know she came to work at JFS at a difficult time when rapid and significant change was needed. Over the last five terms, together with the staff, she achieved that and much more.
“JFS is a different and far better school than it was and she is leaving knowing that those goals were achieved and exceeded.”