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.
As the 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. Working under the artist name of "Joker" (or, in some later works, JP), Berggren nowadays also has his own studio, called The Barn. The former female members of Ace of Base, Linn and Jenny Berggren, are his sisters. He also worked with DJ Bobo, Army of Lovers, E-Type and Meja.

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