Kjell Åke Jörgen Elofsson (born 14 January 1962) is a Swedish songwriter. He was one of the writers of the songwriter-team at Cheiron Studios in Stockholm (along with Denniz PoP, Max Martin, Kristian Lundin, Andreas Carlsson, Rami Yacoub, Per Magnusson, David Kreuger, Herbie Crichlow, Jake Schulze, Alexander Kronlund and Alexandra Talomaa) where he made successful songs such as Britney Spears' "Sometimes" and "(You Drive Me) Crazy".
https://en.wikipedia.org/wiki/J%C3%B6rgen_Elofsson