Joel Nigg, PhD, is a licensed clinical psychologist and research scientist who has been studying children's developmental struggles for over 25 years. He is a Professor of Psychiatry and Behavioral Neuroscience at Oregon Health & Science University and lives in Portland, Oregon.
Educated at Juilliard, Paul Costanzo brings the sensitivity and nuance of a classical music background to his twenty-five-plus years of voice acting, and AudioFile magazine has called his narration "superb."