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 As Ewanick's GM Reign Ends, Fate of Commonwealth Questioned Controversial Exec's Exit Calls Into Question the Fate of 4-Month-Old Omnicom, IPG Venture By Matthew Creamer and Rupal Parekh, Published on July 29, 2012 2 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. Become a Member Already a member? Log in.