He said now was the best time to pass the reins to someone new who could lead the organisation through the next chapter of its journey.
"I truly believe the game is heading in a fantastic direction and I feel very fortunate that I have been able to play a role in shaping that direction, however I think that it is important that the CEO who will lead the organisation through the next chapter be part of creating the next strategic phase."
Chairman Scott Carter acknowledged the extensive work that Doyle, and his team, had achieved during his three-year tenure. "Jim has an exceptional talent for communicating, an outstanding work ethic and a commercial aptitude that is simply first-class. We have been extremely privileged to have Jim lead the organisation through a very critical period and he will undoubtedly be missed by everyone."
Doyle will remain in the chief executive's role until the end of the year.