Shaun William Cooper was born November 12, 1980 in Baldwin, NY. Like his band mates, John Nolan and Michelle DaRosa, he attended Baldwin Senior High School, graduating in 1999. He is the former bass guitar player for Taking Back Sunday. It was Cooper that proposed that he and John Nolan leave Taking Back Sunday in 2003 due to irreconcilable differences. Cooper was then replaced by Matt Rubano. Cooper has maintained a close friendship with Mark O''Connell (drummer) of Taking Back Sunday.

He plays mainly Fender jazz and precision bass guitars.