Interesting insights in this book, especially around effectiveness of introvert managers and extrovert managers for different types of employees -- and the studies around sensitivity. However, it's clear this author has an axe to grind with extroverts. I'm about as introverted as they come, so I know the difficulties of working and living with extroverts. But this author writes as if there are almost no redeeming qualities about extroverts, which frankly makes it difficult to trust her and take her seriously. Also, though I know she provides her own definition of "introvert and extrovert", not following the traditional Myers-Briggs definition also weakens her case. Her definitions simply extend the stereotypes of introvert and extrovert -- and that's the most disturbing part of this book. Under her definition, if I'm identified as an introvert, I'm not simply someone who gets energy from introspection and thought -- I'm shy, socially awkward, can't work when there's lots of noise, and, particularly if I'm a man, I'm thin, pale, unathletic, and I wear glasses. (Don't worry, the definition of extrovert is even less flattering.) This is a great topic, and when she's writing about actual research, there are interesting insights. But it was difficult (sometimes infuriating) to wade through all the emotional baggage the author was clearly carrying.