If you had to guess, what would you say investor Warren Buffett and civil rights activist Rosa Parks had in common? How about Charles Darwin, Al Gore, J.K. Rowling, Albert Einstein, Mahatma Gandhi and Google’s Larry Page? They are icons. They are leaders. And they are introverts.

Despite the corporate world’s insistence on brazen confidence–Speak up! Promote yourself! Network!—one third to half of Americans are believed to be introverts, according to Susan Cain, author of just released Quiet: The Power of Introverts in a World That Can’t Stop Talking. She contends that personality shapes our lives as profoundly as gender and race, and where you fall on the introvert-extrovert spectrum is the single most important aspect of your personality.

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