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 How Sir Martin Cinched $4.5 Billion Deal for Dell Biz WPP Chief's 'Personal Gravitas' Helped Convince Marketer That Holding Company Can Build a 1,000-plus-person Agency to Service Its Massive Marketing Account By Matthew Creamer, Published on December 10, 2007 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.