Johnny Heller has a gift for working with students from absolute beginner to advanced. He is able to help each student with a specific thing that will help that student improve. I especially appreciate that he doesn’t overwhelm newer narrators with everything they will eventually want to improve, but rather works with them on the one or two things that they can master and work with and incorporate at the time.
At the same time he has a keen ear for the thing an already very good narrator can fix to become an even better narrator.