The Charity Commission has promoted David Holdsworth to the role of chief operating officer.
Holdsworth, who joined the regulator in August as head of operations, replaces Tracey Newman, who stood down in the summer for personal reasons after four months in the role.
Holdsworth joined the commission from a senior role at the outsourcing company Serco and before that worked for the outsourcing company Capita.
He also spent more than 10 years working at the Home Office, including in senior operational roles at the Immigration Service, according to a statement from the Charity Commission.
A spokeswoman for the regulator said the appointment was made after the position was externally advertised.
In a statement, Holdsworth said: "In my first few months at the commission, I have been impressed with the people I have met across the directorate. I am really looking forward to leading the teams through the opportunities and challenges that lie ahead."
Paula Sussex, chief executive of the regulator, said Holdsworth’s expertise would be invaluable.
"David has already contributed greatly by leading changes to the way we manage and oversee our case work," she said. "He will take the lead on our wider digital strategy to improve customer experience and increase operational capacity."
The commission said the chief operating officer was responsible for the regulator’s case work, except that involving the highest risks, and for its "digital by default" agenda.
The regulator has begun recruiting for a replacement head of operations.