Someone who writes or adapts theater plays, a playwright, dramatist, especially one connected with a specific theater or company.
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.
To act as a dramaturge.
One who writes for the screen, who writes drama for film or television; especially a professional who knows the conventions appropriate to such work.