Claydon will work full-time at the start-up alongside the managing partner, Martin Brooks, the creative partner, Andy Sandoz, and the planning partner, Patrick Griffith. Brooks said: "Jon is a heavyweight and offers reassurance and passion that's invaluable."
Claydon, who resigned from Zulu in May, said: "I'd planned to take a longer break, but chances like this don't come along very often. Work Club has the firepower to make an enormous impact."
In September, Work Club picked up its first piece of business since its launch in July - a brief to develop a pan-European digital strategy for Coca-Cola's sponsorship of the Euro 2008 football tournament. It has since won a place on the IPC roster after winning a brief for Wallpaper*.