He has been out of the industry since November 2006, after leaving Lowe London, where he was the managing director. He quit just six weeks after the agency had hired Amanda Walsh as the chief executive.
Hunton will co-ordinate the global Land Rover business between Young & Rubicam's two main agency hubs on the account, RKCR/Y&R in London and Young &Rubicam in Irvine, California.
Joining in March, Hunton will oversee the direct marketing and digital aspects of the business through Wunderman and Wunderman Interactive.
James Murphy, the chief executive of RKCR/Y&R, said: "There aren't many more plum account handling jobs in the business than this one. It's a big job and we needed a big talent to fill it. He'll fit into the culture at RKCR/Y&R."
Before joining Lowe in February 2005, Hunton was the managing director and managing partner at Quiet Storm.
Hunton joined McCann Erickson London in 1998 as the deputy managing director and was promoted to chief executive by Ben Langdon, the then chairman and chief executive of the McCann Worldgroup EMEA, in 2001.
He has also worked at Lowe, on the Smirnoff and Weetabix accounts, as well stints at Young & Rubicam and FCB.