Multipliers: How the Best Leaders Make Everyone Smarter: Liz Wiseman, Greg Mckeown: 9780061964398: Amazon.com: Books
Are great leaders born or made? Malcolm Gladwell made a strong case in outliers that the success of great people are greatly influenced bu their environment. I believe that leaders are made, in every case. Some of them are born into situations which give them the proper structure to thrive as a leader, and some of them are born with a higher genetic aptitude for leadership.
However because it's action which defines the individual... Nobody, regardless of genetics, birthright, or upbringing, becomes a great leader without taking the necessary actions.