composer
Such a person is immortal.
A Skeptic person
Ambidextrous, ambi meaning both (abiguous) and dextrous meaning dexterity, flexibility, skillfully.
A person who robs is called a "Robber".
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.
A drawer.
A poetry
publisher
proposal
A person who writes verses is a poet.
Columnist
Author
Reporter
A columnist...?