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 Burger King Splits With Lead Agency Mother Creative Differences Cited As Reason For Latest in String of Agency Partings By Maureen Morrison, Published on January 06, 2014 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. Become a Member Already a member? Log in.