Do you know Cesar Millan, The Dog Whisperer?
I confess that I do not know his techniques for training dogs or people (!), have never watched him on TV or read any of his books. I do know that he is immensely popular. Today's New York Times has a really interesting business article about Millan -- his background, how he started business, how it grew.
Check it out: Whispering to Rottweilers, and to C.E.O.'s. It's a good read.