He replaces founder Sarah Braben, who has moved to the newly created role of chief executive.
Bourn has pledged to grow staff in 2003, and will be targeting film, video and games software companies. 'We will be positioning ourselves as 100 per cent focused on media and entertainment,' he said.
Braben hired Bourn from Harrison Cowley, where he was senior account director with clients such as Royal Bank of Scotland, Waterstones and Camelot.
He will be in charge of day-to-day running of the agency, while Braben herself will focus on developing new business and marketing strategies.
'She will be more involved in strategic level thinking, although she will still be involved in client work,' Bourn added.
Bourn said a large part of his role would be 'bringing more of an entertainment focus into the agency'.