Quinn became a singer and musician and was in an electronic synthesizer band called Telekin. He also co-founded a popular recording studio in Joshua Tree, California.
"Mothers are like that. Yeah, they are." These lines were said by Quinn in a 1963 Bayer Children's Aspirin TV ad which was so popular that it launched Quinn on a decade-long career as a child actor. The last three words were ad-libbed by Quinn but were left in the ad. Most agree that the natural way they were said led to the enormous popularity of the commercial.