The person who writes on behalf of some one else is called a biographer.
A ghost writer
Amanuensis
Erudite
articulate
A Philosopher
A secretary
A journalist.
I believe it is "Reporter". Hope that helps:)
biblioraptor
An author is a person who writes and sells books.
an auto-author, or the author of an autobiography.
A person who writes a will is commonly referred to as the "testator."
A Philosopher
A person who writes the libretto for an opera is simply referred to as the librettist.
an author!!
A poetry
A drawer.
publisher
proposal
A person who writes verses is a poet.
A columnist...?