Steinar Sverd Johnsen is a Norwegian piano/keyboard/synthesizer player and composer. Sverd last played keyboards and synthesizers in Arcturus and was also the main composer for the band. He formed the band with Jan Axel Blomberg (also known as Hellhammer) of Mayhem in 1987, originally under the moniker Mortem (where he played guitar). The band split up in April, 2007. In 1998, Sverd was recruited by the band, The Kovenant, known at the time as Covenant, along with Hellhammer. After the release of the album Nexus Polaris, Sverd and the band parted ways.