Li regilyèman kolabore ak konpozitè Max Martin, epi ansanm yo te pwodwi, ekri, oswa ko-ekri chante pou P!nk, Taylor Swift, Adam Lambert, Britney Spears, Usher, Avril Lavigne, Ariana Grande, Adele, ak Maroon 5. Shellback te kolabore tou ak ko-pwodiktè Benny Blanco e li te pwodwi chante pa tèt li, ki gen ladan "Want U Back" pa Cher Lloyd ak "Animals" pa Maroon 5. Kesyon: Ki moun ki Shellback anjeneral kolabore avèk?
Max Martin