The Alan Turing Institute Chair has told the BBC there is "no substance" to a number of serious accusations which rocked the organisation in the summer.
In August, whistleblowers accused the charity's leadership of misusing public funds, overseeing a "toxic internal culture", and failing to deliver on its mission.
They said the Turing Institute, the UK's national body for artificial intelligence (AI), was on the brink of collapse after Peter Kyle, the then technology secretary, threatened to withdraw its £100m funding.
But speaking exclusively to the BBC, Chair Dr Doug Gurr said the whistleblower claims were "independently investigated" by a third party which found them to have "no substance".
"I fully sympathise that going through any transition is always challenging," he said.
