Swedish guitarist and vocalist with the death metal band Opeth who also the former lead vocalist with Bloodbath.
He toured with his own metal band, which he created at the age of fourteen and left two years after.
Guitar World ranked him #42 among the top 100 greatest heavy metal guitarists of all time.
He married his longtime girlfriend, Anna Sandberg, in 2003. They had their first daughter in September 2004 and a second in 2007. In 2016, he said that he'd gotten divorced.
Like Vegard Tveitan, he has appeared as a guest in an episode of the Adult Swim show Metalocalypse.