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 Liz Ross Named North American CEO of Mediabrands Ventures Former Chief Growth Officer at Digitas Is Tasked With 'Knitting Together' Interpublic Unit's Offerings By Michael Bush, Published on January 20, 2011 0 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.