Jonas Petter Berggren (born 21 March 1967) is a Swedish musician and singer-songwriter and record producer, also known as Joker. He started writing songs when he was seven, and continues to write for the Swedish band Ace of Base, which he is a founding member of, as well as other bands. He was born in Gothenburg, Sweden.

Jonas Petter Berggren was the first child of three siblings; his younger sisters are Linn and Jenny. Jonas was born with a cleft lip, undergoing three surgeries within his first year. He became interested in music when he was 10, after his father started teaching him to play the guitar.

A founding member of Ace of Base, Berggren has written all of their biggest hits, including "All That She Wants", "The Sign", and "Beautiful Life". He also plays the guitar and keyboards. Berggren also has his own recording studio, called The Barn. Two former members of Ace of Base, Linn Berggren and Jenny Berggren, are his sisters. He has also worked with DJ Bobo, Army of Lovers, E-Type, and Meja.

Berggren produced and composed for the album Pride by Swedish pop group Yaki-Da in 1995.

Berggren met Norwegian hairdresser Birthe Haugland during a cruise in Norway in the summer of 1996, and they were married on 12 July 2000. Together they have four children: Julia, born in 1999, Gabriel, born in 2001, Amanda, born in 2006, and Molly, born in 2008.

Source: Article "Jonas Berggren" from Wikipedia in English, licensed under CC-BY-SA 3.0.