mover and shaker
Definition from Wiktionary, the free dictionary
- (idiomatic) someone who has power and influence in some field or activity.
- The sales team sought to talk to the movers and shakers within an organization, rather than to their underlings.
- He really is a mover and a shaker in those circles.
- (idiomatic) The people in an organization who are most responsible for getting things done.
someone who has power
Usage notes 
- This term is used predominantly in the plural.