- Lead singer and guitarrist for the Death Metal band Hypocrisy.
- Owns a studio, Abyss, where he records, mixes and engineers all his bands music.
- Is the lead singer, writer, composer and founder of techno/electronica/metal band Pain.
- He is a record producer and has worked with many bands including Amon Amarth, Dimmu Borgir, Enslaved, Immortal, Children of Bodom and Dark Funeral.
- He is the former lead vocalist for death metal 'supergroup' Bloodbath. He also plays drums for the black metal band War and played guitar for Marduk on their Live In Germania DVD. He also played in the now-defunct black metal band The Abyss.
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