Also known by his stage name Vivian Sin Amor, Katajisto is famous for his membership in the Finnish glam rock group Lovex. His band's debut album, Divine Insanity, rose to number four on Finnish music charts and became a designated gold recording.
He and his bandmates Theon, Christian, Sammy Black, Julian Drain, and Jason founded Lovex in the early 2000s in Tampere, Finland.
Between 2005 and 2007, he and his bandmates released the number one hit song "Guardian Angel" and the Top 5 singles "Bleeding," "Remorse," "Die a Little More," and "Anyone, Anymore."
His relationship with Finnish singer Katra resulted in a daughter named Illusia.
He and Stone member Roope Latvala are both well known Finnish guitarists.