After graduating in 1963, he took a job as a production assistant at the children's television show Captain Kangaroo.
[1] Songs he wrote for its characters to sing include "I Love Trash", "People in Your Neighborhood", "I Don't Want to Live on the Moon" and "Rubber Duckie".
In 1976, the song became a #1 hit in France for Claude François, who recorded it with French lyrics under the title "Sale Bonhomme".
[1] In the late 1970s, Moss wrote Double Feature, a musical that received good reviews when it opened in New Haven, Connecticut.
[1] In 2007, Princeton University ranked Moss as one of its 26 most influential alumni, citing the effect of his songs and characters on the Sesame Street audience.