Canadian David MacNaughton’s reign at Hill and Knowlton’s North American public relations operations has been short-lived.

MacNaughton is returning to his old job – running the Canadian company – and Tom Edson, worldwide chief executive officer of h&k, will run the pr firm’s u.s. operations.

MacNaughton was given responsibilities for North America late last year, but it is understood that the company is going back to its previous structure of having separate Canadian and u.s. operations.

H&K’s corporate parent is British-based WPP Group.