Some of you might get a hoot out of this video, shot during my gig this past summer.
Short of my brief blurb at the top (right after playwright Norm Foster), I try and explain what a Stage Manager does at the 18:20 mark. Apologies if I missed something and, most particularly, for using 'he' when talking SM, rather then something more gender neutral!
http://www.rogerstv.com/page.aspx?sid=5132&rid=72&lid=12