English National Opera chief executive and artistic director Sean Doran is to step down after two years.
Mr Doran has been in the ENO top job for two years
Mr Doran - who will continue to work as ENO artistic consultant - is leaving by mutual agreement, the ENO said.
His responsibilities will be divided with current executive director Loretta Tomasi becoming the chief executive, and John Berry artistic director.
Mr Doran said there had been "big challenges" during his tenure to ensure the ENO's future.
He joined the ENO in April 2003, the same year the government-backed Arts Council of England bailed the company out with a £4.2m grant.
He had previously been director at Australia's Perth International Arts Festival.
Mr Doran's dual role saw him dealing with both artistic and business issues.
Recent ENO productions including On The Town and current show Madam Butterfly have won favourable reviews.
And he oversaw the £41m refurbishment of the Coliseum, the ENO's London base.
But Mr Doran attracted criticism from purists when he announced surtitles would be added to the company's operas from 2006, despite the fact the productions are all sung in English.
In June, evidence of tensions within the ENO emerged when its marketing director apologised after booing departing music director Paul Daniel.
Ian McKay said he had been angered by a newspaper article in which Mr Daniel had spoken about the ENO's future.
ENO chairman Martin Smith said of Mr Doran's departure: "The fact that ENO is enjoying a renaissance, with a very successful season artistically and breaking box office records, owes much to the talent of Sean.
"We are grateful for all that he has achieved at ENO.
"Sean has made an important contribution to ENO. He brought fresh thinking and a new artistic energy."
Mr Doran said he was sad to leave but proud of his achievements.
"I took on this role with a number of big challenges for change that would secure the future of the organisation and these have been met," he said.
"I have greatly enjoyed my time at ENO and leave it in a much stronger position than when I joined."