He is considered to be the first bass player to bring fretless bass playing into the metal genre. He also always plays with his fingers and never resorts to the use of a pick.

In April 2020, DiGiorgio was tested positive for COVID-19. He is the second member of Testament, following Chuck Billy, to have contracted this condition.

According to some sources he played drums on the band Flembile’s demo tape.

Bass (1998-2004, 2014-present)