Because the worst thing you can do is nothing and refuse to decide who should be listening.
The crazy thing is that it's not always who you think it is.
But taking the time to figure it out how to relate to that person will make them want to do what you say.
That's what I talk to Becky Taylor, Marketing Manager at Ohio Insurance Agents Association, about as she figures out who should listen to them.
P.S. Agency Nation University can teach you how to talk really good.