Roger Mosey, who is in charge of the BBC’s hugely successful coverage of London Olympics, has been tapped as acting director of BBC Vision, giving him control of all the pubcaster’s U.K. TV channels.

Mosey takes on the role, considered one of the Beeb’s key positions, on Aug. 20, replacing newly appointed director general George Entwistle. The process of choosing a full-time successor to Entwistle will begin in September.

Mosey has been editor of radio current affairs show “Today,” controller of BBC radio channel 5 Live and head of BBC Sport.

He became director of London 2012 in April 2009, planning the BBC’s coverage of the Olympics, Paralympics and the Cultural Olympiad.

The Olympics saw a peak of 26.9 million tune in for Danny Boyle’s Opening Ceremonies on July 27, while viewership hit a high Sunday night as 20 million watched Jamaican Usain Bolt’s victory in the 100-meter final.

Dave Gordon, head of major events for BBC Sport, will take over from Mosey for the Paralympics, which runs Aug. 29 to Sept. 9.