Glenn John Arnowitz has appeared on stage at The American Actors Theatre, New York City; The Antrim Playhouse, Suffern, NY; The Illustrious Theatre Company, Warwick, NY; The Creative Theatre–Muddy Water Players, Monroe, NY; and the Tri-State Actor's Theatre, Sussex, NJ.

In November 2005, he appeared in Ira Levin’s, Veronica's Room, directed by Paul Meachum. Mr. Levin surprised the cast and attended a performance and said, "This was one of the best productions of Veronica's Room that I have every seen. The actors played their parts so close to the characters I tried to create. The direction, the costumes, and the set design were excellent."