Sir Martin Sorrell was and is a genius. He built the worlds biggest advertising network and delivered enormous shareholder value, career opportunities for thousands, made millionaires out of many, either via personal development or acquisition and now is doing it again with S4.

What seems amusing is that the WPP playbook is, well, his. He was at the helm for 33 years and companies don't change their cultures that quickly. What is more surprising is that he cares what someone else thinks or says.