Greg Christian is the bassist

Bassist

A bass player, or bassist is a musician who plays a bass instrument such as a double bass, bass guitar, keyboard bass or a low brass instrument such as a tuba or sousaphone. Different musical genres tend to be associated with one or more of these instruments...

 for the American thrash metal

Thrash metal

Thrash metal is a subgenre of heavy metal that is characterized usually by its fast tempo and aggression. Songs of the genre typically use fast percussive and low-register guitar riffs, overlaid with shredding-style lead work...

 band Testament

Testament (band)

Testament is an American metal band from Berkeley, California, formed in 1983. They are often credited as one of the most popular bands of the 1980s thrash metal scene...

. He left the band in 1996, but rejoined in 2004.

Testament

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 the upcoming one The Dark Roots of Earth. He also played on the live albums, Live at Eindhoven, Return to the Apocalyptic City and Live at the Filmore.. In 1996, Christian left Testament, but rejoined in 2004. He is known for his finger playing style and jazz-like bass parts. This can be heard on songs like Souls of Black

Souls of Black

Souls of Black is the fourth album by American Thrash metal band Testament, released in 1990. It preceded several changes in style to rather diverse styles of metal, including the traditional heavy metal sound heard in its succeeding album, The Ritual....

 and Disciples of the Watch. Christian also does backing vocals in Testament.