Every agency has a person or a group of people whose job it is is to find "resources" when a project needs a copywriter and/or an art director.
This used to be a fairly simple matter. The person would go through their rolodex or Excel spreadsheet and say, "Oh, Marcia would be perfect for this, I'll give her a ring-a-ling."
After a few calls, a "resource" would be "acquired" and the "deliverables" would be on their way to being "ideated."
Today, of course, nothing is that simple.
I happened upon this description of one of these people recently.