A Ghost of a Chance!
I'm not sure if this is a topic you have any experience with, but I'm wondering how folks break into ghostwriting. I've heard from a few people that their agents set them up with others among their clients who needed writers. Is this something you've done? Any other insight you might be able to offer into how all this works?
I don't take on people who are principally ghost writers. I rep them for a single project, usually one that I've brought to them. I keep a list in my mink lined address book(the one that George Clooney would have given me had he not been tied up filming in Paris when I saw it at Bloomies and fell on it with rapturous screams...but I digress) of people who are ghostly.
I don't do a lot of work requiring ghosties cause my work is primarily novels and genre fiction. I know that one of the "musts" for a ghost are publishing credentials up the wazoo, so think about getting your freelance writing career in gear as you look for ghost jobs.
You'll want to know editors too cause sometimes I'll get names from editors who love everything about a project except the writing.
And the biggest hint of all is keep your email and phone contact info current. Have a website with your name; I can't tell you the number of people I don't try to call a second time when they don't answer the first call or their number is out of date or their email bounces. Be easy to find. Be easy to work with.