I'm a full-time ghostwriter who makes a living discerning a client's requirements and writing text to match. You don't say how short "short" is, but I'm flexible for most lengths and I think I am the writer you're looking for. I've just finished a series of children's adventure stories for a London publisher, 10 books at 10,000 words each. If you have a shorter length than that in mind, I've also had several short stories published. I've written fiction (adventure, survival, science fiction, fantasy, crime) and non-fiction (academic, IT, technology biography, religion), all of which has been professionally published.
If you think I might be the one, I'll be happy to discuss further.