after the turmoil in No 10 became public, allies of Mr Cummings and Mr Cain were accused of calling Ms Symonds “Princess Nut Nuts”.
Mr Rosenfield is expected to set a more measured and conciliatory tone upon his return to the Civil Service more than 20 years since joining the Whitehall ranks.
His first job after finishing his degree at University College London was as a policy adviser at HM Treasury, he explained to the Jewish Telegraph. Indeed, it was the first job he applied for as a fresh graduate.
He told the paper: “I thought I would give it a go as it was something I was interested in and that it would be a good interview experience.
“I had no expectation of getting it, but I remember reading the letter and feeling thrilled and exhilarated — I actually thought it was a mistake.”
But on his first day, in September, 2000, his boss greeted him with a disarming question: “So, when are you going to get a proper job?”.
Mr Rosenfield’s appointment was welcomed by Mr Osborne’s former chief of staff, Rupert Harrison, who worked with him in the Treasury.
“Dan is a class act and an inspired appointment,” he tweeted.
“He was the principal private secretary in the chancellor’s office who managed the transition from Alistair Darling to George Osborne.
“Bright, tough and politically savvy with a small ‘p’.”
Former Treasury minister David Gauke, one of the pro-Remainers purged from the Tory Party by Boris Johnson, agreed he was a sensible choice.
“I’m probably not doing him any favours in saying this but Dan Rosenfield is smart, likeable and effective. This should be a good appointment,” he tweeted.
He is expected to spend his first weeks in Downing Street meeting with ministers, Conservative MPs and the wider No 10 team.