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 Yahoo Chief Revenue Officer Michael Barrett to Exit Leaves in Wake of Appointment of Google Exec Henrique de Castro As COO By Jason Del Rey, Published on October 16, 2012 1 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.