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 DDB Chicago's New-Business Exec Is Out Nancy Leibig to Leave Struggling Office as Biz Development Gets Restructured on Network Level By Jeremy Mullman, Published on March 18, 2010 4 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.