Councillor Mark Bee has decided to step down as leader of Suffolk County Council after four years in the role.
The Conservative Group will elect a new leader at its annual general meeting next week.
As spokesman for the Conservative Group at the council said since taking over as leader in 2011, at the time when the council was suffering political and reputational problems, Mark had steered it into much calmer waters.
He said: “Over the course of four years as leader, Mark has overseen budget savings of around £130 million, as the council had redesigned services to be more efficient and more effective at meeting the needs of residents.
“He was responsible for securing the investment in better broadband for Suffolk, and being the first county in the country to secure a second contract to roll out superfast broadband.
“A hallmark of his time as leader has been the way he has built partnerships between organisations, both within the public sector and beyond.
“His work with the New Anglia Local Enterprise Partnership in particular has helped secure vital funding for major projects in our county.
“This led to his being shortlisted, earlier this year, for a national award for Partnership Achievement of the Year.”
Fellow Conservative councillor Joanna Spicer said: “This is sad news for Suffolk and I am sure will trigger a huge amount of thanks and praise for Mark Bee from organisations and their leadership right across Suffolk.
“Four years ago the county council faced a crisis of confidence and all of the credit for our speedy recovery should go to Mark.
“His great sense of humour and commitment to public service have made an impression on many people across the county”