The agency appointed will be the one best able 'to promote Zone and its clients to businesses,' he said.
'We want to ensure businesses pay more than lip-service to the much-voiced claim that content is king.
'People know our clients, but they don't know who we are. We need to get our name into the public and business domain,' he added.
Zone develops, produces and publishes online and offline content. The Camden-based firm was set up ten years ago to produce Manchester United magazine, which became the UK's biggest-selling sports monthly, and was sold to Future Publishing two years ago.
Zone has also created websites for channel4.com (cricket section), filmfour.com, Children's BBC (sports) and football stars' site icons.com.
Zone has 30 permanent staff and employs 20 more on a freelance basis.
It has recently developed a press-tracking device for consumer PR shop The Red Consultancy.