Gordon Seabright will leave his job as chief executive of the Eden Project at the end of this month, after five and a half years at the charity.
He joined the charity in 2014 from Cycling UK, where he had been chief executive since 2012.
During his tenure, the charity acquired the National Wildflower Centre and its income grew from £23.2 in 2014 to £29.4m in 2018.
Seabright has not said what he will be doing next, but did say that he felt it was the right time for him to go.
He said: “It has been an enormous privilege to lead the Eden Project, but after five and a half years I feel the time is now right for me to pass the baton on to my successor.
“We have built a resilient platform from which Eden can now deliver on its ambitious plans, both in the UK and internationally.
“I am immensely proud of the commitment of the Eden team to tackling the world’s environmental, educational and social challenges, and I look forward to the Project’s continuing success.”
Seabright will be stepping down at the end of January and Eden Project said it will immediately start looking for a replacement.
Sanjeev Gandhi, chair of the Eden Project, said: “We thank Gordon for his considerable contribution to Eden’s success over the last five and a half years. During Gordon’s time as CEO he has brought stability and financial resilience to the Eden Project.
“Gordon has set the organisation on the path to its next stage of development. His calm and assured leadership will be greatly missed and we wish him every success in his future endeavours. He will remain a lifelong friend of the Eden Project.”
The Eden Project site in Cornwall has more than one million visitors a year and the charity employs more than 470 people.