A good friend of Garry Shider, the two left Plainfield, New Jersey in their teens for Canada.
They joined a band called United Soul, which came to the attention of George Clinton, who had known Shider as a youth in Plainfield.
After producing United Soul, Clinton then invited Mosson and Shider to join Parliament-Funkadelic.
Mosson was a prominent contributor to albums by both Funkadelic and Parliament from 1972 until the dissolution of the two groups in the early 1980s, and was the featured on-stage bassist for Parliament-Funkadelic after Bootsy Collins went solo.
While Collins is more widely remembered as the P-Funk bassist, Mosson's contributions were arguably more numerous and are well regarded by fans.