The headteacher of one of the country's most improved secondary schools, in Durham, has been suspended since December, awaiting an investigation.
Anne Lakey, who is chief executive of the Durham Federation, was suspended from her job before Christmas while enquiries were made.
The federation includes two schools, Durham Community Business College and Fyndoune Community College.
Last year Fyndoune Community College became the most improved school in the country for GCSE results and both schools were also rated outstanding by school inspectors Ofsted.
Durham County Council confirmed the suspension of Ms Lakey, who has been a teacher since 1982, but would not say the reason why it had happened.
– Caroline O'Neill, head of education at Durham County Council
"I can confirm the chief executive at Durham Federation was suspended in December pending the outcome of an investigation.
"It is important to say that suspension is a neutral position and not an implication of any wrongdoing.
"Until enquiries are complete it would not be appropriate to say anything further."