​From Wikipedia, the free encyclopedia.  

Jan Axel "Hellhammer" Blomberg (born August 2, 1969, in Trysil, Norway) is a three time Spellemannprisen award-winning heavy metal drummer. He is most well-known for his drumming with the band Mayhem, with which he began his career. He is endorsed by Paiste, Axis Pedals and Pearl drums, though he has been known to use Yamaha drums as well.

He joined Mayhem in 1988, following the departure of the drummer and founding member Kjetil Manheim. In addition to Mayhem, one of his long-standing bands was the avant-garde metal band Arcturus, which he formed with Steinar Sverd Johnsen in 1987, originally under the name Mortem, and broke up in April 2007. He has since joined and sessioned for numerous bands.

Description above from the Wikipedia article Jan Axel Blomberg, licensed under CC-BY-SA, full list of contributors on Wikipedia.