You can say he shows **"leadership"**.

>- leadership - "the power or ability to lead other people" [MW](http://www.merriam-webster.com/dictionary/leadership) 

"He showed strong leadership. That's why we was promoted." 


>- lead - (verb) -"to direct on a course or in a direction" 
>- leader - (noun) "one who has influence or power" - [The Free Dictionary](http://www.thefreedictionary.com/leader)