He writes, talks and advises on all things marketing and in a nutshell the guy has been there, done it and bought the marketing t-shirt.
In a recent column for Marketing Week he wrote an article entitled 'The seven dumbest sins of social media' in which he pours scorn on the concept of social media being marketing's holy grail.
Unsurprisingly, lots of people lept to the defence of the Tweeting, Facebooking community and the comments flowed freely. In fact it was the most comments Mark had ever had for something he'd written for the publication.
Yes, Mark admits the article was written to deliberately provoke marketing folk around the world - but for me, he certainly puts forward a lot of valid points.
Have a read and see what you think.
I wonder how many people in transport community would agree with him?