BBC Worldwide CEO John Smith has been at the helm of the commercial arm of the BBC for the past eight years. After a total 18 years at the broadcaster, he told staff today he was leaving to pursue new opportunities in the commercial sector. Tim Davie, the BBC’s director of audio & music, will succeed Smith as CEO starting December 1. During Smith’s tenure, BBCW doubled revenues, tripled margins and quadrupled profits with the last fiscal year hitting £155M, the company said today. Among its businesses, BBCW operates international channels including BBC America and exploits and produces formats. Smith is credited with helping grow such global franchises as Dancing With The Stars, Doctor Who and Top Gear. Davie has been in his current role since 2008 and before that was director of the BBC’s marketing, communications & audiences division. He came to the BBC in 2005 from Pepsi Europe where he was a marketing and franchise exec.