(n.) One who keeps a diary.

Boswell advertising writer annalist art critic author authoress autobiographer autobiographist belletrist bibliographer biographer calendar maker calendarist chronicler chronographer chronologer chronologist clockmaker coauthor collaborator columnist compiler composer copywriter creative writer critic dance critic drama critic dramatist encyclopedist essayist free lance free-lance writer ghost ghostwriter historian historiographer horologist humorist inditer literary artist literary craftsman literary critic literary man litterateur logographer magazine writer man of letters memorialist monographer music critic newspaperman novelettist novelist pamphleteer penwoman poet prose writer reviewer scenario writer scenarist scribe scriptwriter short-story writer storyteller technical writer timekeeper timer watchmaker word painter wordsmith writer