Steve Di Giorgio (born November 7, 1967, Waukegan, Illinois) is an American bassist and musician. Current resident of Antioch, California.In January 2014 it was announced that he would be replacing Greg Christian as the bass player for Testament.Di Giorgio has played bass guitar in heavy metal bands such as Death, Autopsy, Control Denied, Testament, Vintersorg, Iced Earth, Sebastian Bach, Charred Walls of the Damned, Obituary, and is a founding member of Sadus. He is widely renowned for his technical skills on the fretless bass. He is also a founding member of the jazz-band Dark Hall and is currently the bass player for Futures End and Soen. Along with his bass duties in Sadus he also plays keyboards.Within his genre, Steve Di Giorgio is respected for his playing skills. He is noted for his ability to execute very fast 32nd notes with his plucking fingers, as opposed to using a pick.Di Giorgio uses a custom Mjolnir by Thor Bass, and also plays custom ESP basses. He is mostly seen with a F-series fretless 5-string bass in a dark green finish, but also uses a very unusual double-neck construction with a fretted and a fretless neck in one body. He uses Ampeg SVT Classic amps and cabinets by Ampeg and Randall.