He penned the country parody A Girl Named Johnny Cash, which charted for five weeks.

Mull was also a gifted painter and studied at the Rhode Island School of Design. Actress Melissa Joan Hart called him “a great person who made the world better.”
He is survived by his wife Wendy Haas and daughter Maggie, who said, “He’ll be missed by artists, comedians, and many dogs — but mostly by us.”