Marketing chief resigns from GM
General Motors Co. says that its global chief marketing officer, Joel Ewanick, has resigned from the Detroit automaker. The announcement follows major changes in the company’s advertising approach and comes just ahead of its second-quarter earnings report on Thursday. GM said Ewanick had elected to resign, effective immediately. The 52-year old joined the company in 2010 to oversee marketing for the North American unit and was promoted within months to head global marketing.