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) 

Edit - As you have edited saying you don't mean someone who leads, but somenone who is experienced, influent, and whose opinion carries a lot of weight, a think you mean **"a management guru".**

>- **guru** - "a person who has a lot of experience in or knowledge about a particular subject". [MW](http://www.merriam-webster.com/dictionary/guru)

>- An influential teacher or popular expert:
 ‘a management guru’ [Oxford Dictionary Online](http://www.oxforddictionaries.com/definition/english/guru)