Gen-i head Chris Quin – widely tipped to replace outgoing Telecom chief executive Paul Reynolds until the revelation that Simon Moutter had been appointed to the role – will act as interim CEO from June 1.
Reynolds will step down next month on June 1 and leave the company on June 30, the end of its financial year.
Moutter takes over on September 1, while Quin will run the show during the transition period
Reynolds said he was proud to leave Telecom in a healthy state.
"Telecom has successfully navigated the enormous challenges of the past five years and looks forward to great opportunities ahead as New Zealand moves into a world-first industry structure of open access-fibre networks.
"Telecom is now subject to significantly less regulation which enables the company to focus on delivering for its customers. Shareholders have seen strong benefits and I have no doubt that Telecom will continue to progress and improve," he said.