Johan Schuster（1985年2月1日出生），专业称为Shellback，是瑞典歌曲作家，唱片制作人和音乐家。 在Billboard杂志的年终排行榜上，Shellback被列为2012年第一大制作人，同年他也在“十大歌曲作者Airplay排行榜”榜单中名列前茅; 他赢得了四项格莱美奖。

他经常与作曲家Max Martin合作，他们一起为P！nk，Taylor Swift，Adam Lambert，Britney Spears，Usher，Avril Lavigne，Ariana Grande，Adele和Maroon制作，编写和/或共同创作歌曲。 Shellback还与其他制片人Benny Blanco合作。 他还独自制作歌曲，包括Cher Lloyd的“Want U Back”和Maroon 5的“Animals”。

Johan Schuster ( born 1 February 1985), known professionally as Shellback, is a Swedish songwriter, record producer, and musician. Shellback was listed as the No. 1 producer of 2012 on Billboard magazine's year end chart, and he also topped the list of their "Top 10 Songwriters Airplay Chart" the same year; he has won four Grammy Awards.

He regularly collaborates with songwriter Max Martin, and together they have produced, written, and/or co-written songs for P!nk, Taylor Swift, Adam Lambert, Britney Spears, Usher, Avril Lavigne, Ariana Grande, Adele, and Maroon 5. Shellback has also collaborated with fellow producer Benny Blanco. He has also produced songs by himself, including "Want U Back" by Cher Lloyd and "Animals" by Maroon 5.