Ploy to sell the book?
Yes Jody, the video of "Dr. Mark Alter" could very well be a mock-up. Further googling brought out other pictures, that were similiar to his likeness, but upon further reading of the Amazoin book reviews, I see he probably doesn't exist at all.
I think the author created him as a ficticious character to sell the book.
It DOES add a bit of a thrill to an already explosive book though. LOL