Best known for his work with the rock group Europe -- famous for its international hit "The Final Countdown" -- this Swedish bassist became a member of the band in the early 1980s and was still performing with the group at the conclusion of the first decade of the Twenty-first Century.
In 1981, he replaced Europe's original bassist, Peter Olsson.
During Europe's 1990s hiatus, Leven performed and toured with artists and bands such as
He was raised primarily in the Stockholm suburb of Upplands Vasby, Sweden. He later had a long-term relationship that resulted in three sons: Adrian, Alex, and Daniel.
He and rock vocalist Joey Tempest were Europe bandmates.