Mitchell will report to UK CEO Matt Carter and will provide strategic counsel to corporate and public affairs clients.
Carter told PRWeek: ‘Clarence has first-class experience in handling the media, as a BBC journalist, a government media adviser and someone who’s faced the cameras regularly on behalf of his clients. He’s a great addition to B-M’s UK team.’
Mitchell was most recently director of media strategy and public affairs at Lewis PR, a role he combined with his duties as official media spokesman for Kate and Gerry McCann. Before that he was a consultant with Freud Communications.
Mitchell also held the position of director of the Conservative Party's Election Media Monitoring Unit, reporting directly to director of communications Andy Coulson.
Before moving into government comms and PR, he was a news correspondent and presenter with BBC News.
He said of the move: ‘With Burson-Marsteller’s global reach and evidence-based approach to communications, I know it’s an environment I will thrive in. I’m excited by the campaign challenges to come.’