Mark does speaking engagements too, and appears to do a great job of demonstrating nonverbal techniques, as can be seen from this video:
The thing is, I had a telephone conversation earlier today with general semantics expert Sanford Berman, who has a PhD in Communication, and studied with S. I. Hayakawa and Irving Lee. Sandy was criticizing contemporary Communication departments for abandoning the teaching of effective communication, which, on the verbal side, included a good, strong dose of general semantics. And he has a point, it's much like English departments abandoning the teaching of literature in favor of theory. Understanding verbal and nonverbal communication will serve students much better in life than teaching them about Foucault, Derrida, Baudrillard, Zizek, and company.
So, I wish the best of luck to Mark Bowden, I'll admit to having learned some new tricks from his videos (old dog that I am), and more importantly this has given me food for thought (but now I need to go get some dinner).