In David Mamet’s A Life in the Theatre a clever and sharply observed ode to the trials and joys of a life spent on stage, audiences are introduced to Robert, an aging actor, intent on teaching John, a young up-and-comer, the tricks and truths of the trade. As the two spar onstage and off, the audience becomes a fly on the dressing room wall, watching the almost imperceptible but deeply felt shift in power that occurs between teacher and pupil. John Seibert directs.