Christian is an original member of Testament, beginning with the band when they were still known as Legacy. He recorded many of the band's albums including The Legacy, The New Order, Practice What You Preach, Souls of Black, The Ritual, Low, The Formation of Damnation, and Testament's most recent album Dark Roots of Earth. He also played on the live albums, Live at Eindhoven, Return to the Apocalyptic City, Live at the Filmore, Live in London and Dark Roots of Thrash. In 1996, Christian left Testament, but rejoined in 2004. He is known for his finger playing style and jazz-like bass parts which can be heard on songs like "Souls of Black" and "Disciples of the Watch". Christian also performed backing vocals in Testament.