- Billy Simpson is known for Oliver Twist (1974), The Last of Mrs. Lincoln (1976) and The World Through the Eyes of Children (1975).
- Voices the character of Whimsical Will on the "Demented News" segment featured on the Dr. Demento Radio Show and the Dr. Demento Show on streaming internet.
- Voiced the character of Christopher Robin in the Winnie the Pooh series of Little Golden Books Records for Disney.
- Voiced the title role in the Grammy-winning LP of "The Little Prince" (1974) with Richard Burton.
- Voiced the role of Young Spock in the Yesteryear episode of Star Trek: The Animated Series.
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