The chief executive officer of Norfolk's Police and Crime Commissioner is to retire at the end of the year.
Chris Harding, who was made an MBE in 2006 for services to policing, held the same role at the county's police authority for 12 years before the organisation was replaced by an elected PCC.
He led the transition following last November's elections, when former police authority chairman Stephen Bett was voted in, but now says it is time to leave.
He said he felt very fortunate to have had a "rewarding, enjoyable, if sometimes challenging, public service career".
Norfolk PCC Mr Bett said: “Chris has been a dedicated public servant and a first-class colleague for many years.
“He will be a hard act to follow and he will be greatly missed.”
The search for a new chief executive will begin soon.