McCann Worldgroup, a company of the Interpublic Group, announced that it will assume exclusive responsibility for Commonwealth, an agency that it owned jointly with Goodby, Silverstein & Partners, an Omnicom Group company, following the accord reached in March 2012.Commonwealth will continue as the global ad agency for Chevrolet, working together with resources of IPG and Omnicon, including Agency 720 and Fleishman Hillard.At the same time, all current employees at the Detroit office of Goodby will be offered employment consistent with their current employment terms McCann said.
