Today, more than ever, we are aware of the power of personality. Are we introverted, extroverted, neurotic, open-minded? Psychology has always taught that there are personality types, some advantageous, some not so much, and the common perception is that we are stuck with what we have been dealt. The introvert will never come out of his shell, the narcissist will forever be stuck staring in the mirror (or tweeting endlessly about perceived attacks on his brilliance). Here it is argued that, contrary to this belief, we can shape our personality to our own advantage. In psychological terms, although our initial personality type is shaped by a combination of genetic influences and early experiences, it is not fixed. It is malleable, even voluntary. This book tells the story of how our personality is formed and gives us the tools to shape it in the way we wish and that benefits us the most.