Famous songwriter and musician for the heavy metal bands Black Sabbath and Heaven & Hell. He was among the first bassists to use the wah-wah pedal.
His activism spilled over into a boycott campaign against Fortnum and Mason's for carrying foie grass in their inventory.
His family was Irish Catholic. He married Gloria Butler, the manager of Heaven & Hell and he and Gloria raised a son named Terrence.
He began playing alongside fellow bandmate and good friend Ozzy Osbourne in the 1960s.