Salmon did not set out to become an actor; he had planned to become an electrical engineer after graduating high school. He was cast as Kenny after youth group leader George Reynolds recommended him to Roger Price, who was conducting a nationwide search for teenage actors. Salmon was then given acting lessons in preparation for his debut.
After the first season, Salmon left the show due to creative differences. He returned to school, graduated from college, and eventually realized his goal of becoming an electrical engineer.