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 Publicis Worldwide Names U.K. Chief Ahead of Omnicom Merger CEO Arthur Sadoun Hires Guy Wieynk to Boost Digital Credentials By Emma Hall, Published on May 01, 2014 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.