proposal
A jingler
you call the first person you wanted to call and then press flash and then called the second person and then press another flash and there you go , a three way call.
To the point
a polictian
a person who tells proudly about himself is a boaster or a braggart.
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.
publisher
A poetry
A person who writes verses is a poet.
A columnist...?
The word is referee.
Procedural Author
A screenwriter
Columnist