Born by the name, Karl Martin Sandberg more commonly known by his professional name, Max Martin. He has been known for songwriting. He has collaborated with Taylor Swift, Brittany Spears, The Backstreet Boys, Jessie J, P!nk, Katy Perry and many others.
His works with Taylor Swift
Max Martin has been mostly know for his works co-writing (along with Swift and Shellback as well) some of Swift's biggest hits. Many of his most notable works were for; We Are Never Getting Back Together (2012 'Red'), I Knew You Were Trouble (2012 Red), 22 (2012 'Red') and Billboard 100's No. 1: Shake It Off (2014 '1989').