Colin Rudd has been around with ITIL since kindergarten (it takes time to hear it from his mouth… Go for the bit at 1h:43m:45s…). And it shows. He’s prolific on ITIL and ISO/IEC 20000 being responsible for ITIL books, training and consulting.
I’ve had pleasure of knowing him in person and he is a communicator (he can’t seem capable of saying no everytime we invite him to Portugal).
If you read Sharon Taylor’s Official intro book you’ll recognize his hand in the first diagram for every Service Lifecycle phase chapter. That’s no coincidence.
For a taste of his writing and visuals look at the free ITIL v2 overview book.