You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract GM Hires Joel Ewanick as Marketing Chief Short-Lived Nissan CMO to Replace Susan Docherty at Automaker With $2.9 Billion U.S. Ad Budget By Jesse Snyder, Published on May 05, 2010 5 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Register Now Already a member? Log in.