I have been teaching playwriting since 1990 and screenwriting since 1998. My total love for theatre and movies (and TV too) as well as the history of these genres, drives my instruction. I'm always intrigued at the seemingly infinite number of ways people want to tell a visual story. Just when I thought I'd seen it all, some student will come to a class, or send me an assignment, that will test the boundaries of everything I thought I knew about writing for the Stage and Screen. And that's when the fun begins. As I read something I'm working on, I'll often stop and think "I'd never accept this from a student," shake my head, hit the "delete" button, and try it again.
It all pays off when I'm sitting in a theatre, or a classroom, and watching (or listening) to a student's work being read or performed. I remember the piece's various drafts. I marvel when something I told the student wouldn't work does work after all. I can feel the attention being paid to the spoken word. And I can't imagine doing anything else.