Öberg was born in Stockholm on 6 August 1978. When he was seven, he took classical guitar lessons at school. He played electric guitar when he was twelve years old under the influence of a teacher who played blues and jazz fusion. He studied at the Royal College of Music in Stockholm.
Notable releases with songs by Öberg are Girls’ Generation’s RIAJ platinum-certified album Girls & Peace and their gold album Love & Peace (with the four co-written songs “Motorcycle”, “Gossip Girls”, “Do the Catwalk” and “Lingua Franca”) and TVXQ’s RIAJ platinum Tree and With.
In 2015 SHINee’s album, Odd (including “Romance”, co-written by Öberg), topped the Korean Gaon album chart for two consecutive weeks and the Billboard World Albums chart at the end of May 2015.
In May 2016, Namie Amuro released her single “Mint” where both the A- and B-sides (“Mint” and “Chit Chat”) were co-written and co-produced by Oberg. The song sold more the 100,000 digital copies in Japan and was certified Gold. In June 2016, EXO released their album EX’ACT, which included “Stronger”, cowritten by Oberg. The album was the most sold in the world according to Global Album chart and has sold more than one million physical copies.