Boris Johnson is to take charge of London's Olympic legacy, with current legacy chairman Daniel Moylan standing down after just four months in charge.
Moylan took on the role of chairman of the 2012 Olympics legacy body the London Legacy Development Corporation in May, replacing Baroness Margaret Ford.
He will now become the Mayor of London's full-time adviser on aviation policy, with Johnson taking on the Olympic legacy responsibilities.
Moylan was deputy chair of mayoral agency Transport for London in Johnson's last administration.
The Kensington and Chelsea councillor was first proposed by Johnson to be chair of the LLDC, which was established on 1 April 2012 to replace the Olympic Park Legacy Company.
Johnson said: "Daniel Moylan is a gifted politician with a superb brain. I've asked Daniel to take on one of the most important challenges of my second term, the vital task of driving our aviation policy.
"London is the heartbeat of the UK's economy. We must remain competitive, and to do that we need a coherent aviation strategy for 21st-century London. Daniel Moylan will help me deliver that."