Shellback

About

Swedish songwriter and producer who was listed as the Number 1 producer of 2012 in Billboard Magazine's year-end issue. He produced most of the songs on Taylor Swift's 2025 album, The Life of a Showgirl. 

Before fame

He started out as a drummer in local bands before becoming a vocalist in hardcore metal bands, leading him to meet Max Martin, an event that catapulted his career.

Trivia

He was signed to Max Martin's production company Maratone and helped to write at least six number-one singles. 

Family life

He was born Karl Johan Schuster in Karlshamn, Sweden

Associated with

He wrote many songs for Britney Spears, including If U Seek Amy and 3.