What do Chopin, Letterman, Eleanor Roosevelt, van Gogh, Rosa Parks and Einstein have in common? They are all introverts. Add Susan Cain to that list. She's the author of a new book about the third of the planet who prefer listening to speaking, reading to partying; and working on their own to brainstorming. If you are an introvert or if you are an extrovert who just doesn't get them there is something to be learned in Quiet.