A Philosopher
A secretary
A journalist.
The person who writes on behalf of some one else is called a biographer.
She impressively hit all the high notes in her singing performance. He hit impressively at batting practice.
The person who makes a will (or 'testament') is a testator.
A Philosopher
A person who writes the libretto for an opera is simply referred to as the librettist.
A drawer.
proposal
publisher
A poetry
Someone who speaks dramatically and impressively could be called a declaim or an orator.
A person who writes verses is a poet.
A columnist...?
The word is referee.
Procedural Author