Lead guitarist and vocalist for the death metal band Children of Bodom. He has also played with Impaled Nazarene and Warmen. He has been ranked one of the The Greatest Metal Frontmen of All Time by Roadrunner Records.
His musical training started with the violin at age nine.
As a side project, he founded the melodic death metal bands Sinergy and Kylähullut.
He grew up in the Finnish town of Espoo. He was married to Kimberly Goss from 2002 to 2004.
Inspired by Ozzy Osbourne, he tattooed "COBHC," an acronym that stands for Children of Bodom Hate Crew on his hand.