Laurent Ezekiel has his work cut out for him: The Publicis vet joined WPP in May to serve as its first CMO and growth officer. It's a new position at the world's largest advertising holding company, which was the worst performing agency holding company in 2018. He discusses how WPP aims to dig out of its hole and explains what his new boss, WPP CEO Mark Read, means when he talks about becoming a "creative transformation company."