dramaturge

A literary adviser or editor in a theater, opera, or film company that researches, selects, adapts, edits, and interprets scripts, libretti, texts, and printed programs (or helps others with these tasks), consults with authors, and does public relations work.

(rare) Someone who writes or adapts theater plays; a playwright or dramatist, especially one connected with a specific theater or company.

(rare) To act as a dramaturge.