David Hornby has left Visit London after six years as commercial director to work on a number of projects, one of which will be with AEG Europe, which owns London's O2.
Visit London said Hornby, C&IT's blogger, left the organisation on Friday.
Visit London's interim CEO Sally Chatterjee said: "After six years with the Visit London, David Hornby has made the decision to leave to focus on new challenges and opportunities. We would like to thank David for his hard work and contribution to the business and to wish him every success for the future."
She added: "Tracy Halliwell will continue to head up London's Business and Convention Services. Plans to find a suitable head for Events for London will be developed over the next few weeks."
Hornby said: "Six years is a long time in the role - you either stay and go on through the Olympics or look for something new. I will still be involved in the Olympics but I felt it was a good time to go. With three years to go, it means I can be involved in driving other projects while championing and supporting the Games."
Hornby will continue to work within the industry, initially with a role at AEG to drive its meetings and events focus. "I will be working on projects within the industry - such as the role at AEG, for the next six to twelve months. I will continue to champion the Olympics for both London and the UK as I really do believe that people need to understand the financial and commercial benefit that the Games offer. I will still be very vocal on this," Hornby added.
AEG Europe president and CEO David Campbell said: "I am delighted to have David working with the team, providing strategic advice to AEG Europe on the future development of The O2's hotel and event facilities."