One quality or trait that many employer looks for in a leader is the ability to not only perform well yourself but to also elevate the performance of others around you.
For example, Steve Nash was an elite point guard and an all-star that made the people around him better. He made Shawn Marion and Amare Stoudemire all-stars and afterwards, when they were no longer teammates, they were not able to play at their all-star levels.
You could say that Steve Nash is a great leader but it does not inherently imply that he also makes the people around him.
Is there a specific word that describes this? A phrase to describe it would be, "he brings the best out of others", but I cannot think of a word to describe this ability/trait.