The producer of Animals (Maroon 5 song) is a Swedish songwriter who worked with Taylor Swift in 2010.
 Swift began composing the album following release of previous studio effort, "Red" (2012). 
Karl Johan Schuster (] ; born 1 February 1985), known professionally as Shellback, is a Swedish songwriter, record producer, and musician. 
 It was written by Adam Levine, Benny Blanco and Shellback; the latter is also the producer. 
