Other forms: ghostwriters
Someone whose job involves drafting books, songs, or speeches that are credited to someone else is a ghostwriter. A movie star might pay a ghostwriter to pen her memoir, for example.
If you don't want the bother of actually writing a book, but you like the idea of your name on its cover, you may want to hire a ghostwriter. Sometimes a ghostwriter gets credit for being a "researcher," but usually their name doesn't appear anywhere on the book, screenplay, or magazine article. Politicians sometimes employ ghostwriters to work on speeches, and celebrities routinely use ghostwriters to write "autobiographies."