Chuck Billy — born in the United States in 1962 — has been Testament's vocalist since 1986, and is one of the most recognisable voices in thrash metal. His timbre is what separates Testament from the other Bay Area bands. Where 1980s Californian thrash leaned on high, torn vocals, Billy sings in a low, full-bodied register, with a baritone's weight and clear articulation — a device that gives the tracks a different authority and that later allowed him to bring in growls without sounding like a change of band. He is of Indigenous descent — of the Pomo people of California — and has never treated that as a biographical detail: he has taken part in projects tied to Indigenous causes and is one of the few prominent Native American presences in the history of metal. In 2001 he was diagnosed with a rare cancer, a germ cell seminoma lodged in his chest. He underwent prolonged treatment, and Testament's return came after his recovery — the band went nine years without a studio record between The Gathering (1999) and The Formation of Damnation (2008), an interval corresponding directly to that period. He returned to the stage and has kept the band in continuous activity since, with Testament standing among thrash's central names at festivals worldwide.

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