Is often credited as Black Sabbath's principal songwriterBassist for the legendary heavy metal band Black SabbathLeft Black Sabbath in 1984, saying in interviews that he was "sick of it all." However, he officially returned to the group in 1991. He recorded two more albums with Black Sabbath (1992's "Dehumanizer" and 1994's "Cross Purposes") before leaving again in 1994. Soon afterwards, he formed his own band called G/Z/R.Occasionally played bass for former Black Sabbath bandmate Ozzy Osbourne during Ozzy's solo career; appears on the live album "Just Say Ozzy" (1990) and on Ozzy's 1995 album "Ozzmosis".Originally played guitar, but when Black Sabbath formed they needed a bass player, so he switched to bass.Is a fan of "Doctor Who" (1963), and makes references to this TV show in some songs found on his second solo album.Got nicknamed "Geezer" (a British slang term for "guy" or "dude"), because of his own habit of referring to everybody as a "geezer" at the time.Was Black Sabbath's main lyricist throughout the 1970sPlayed on all of the classic Black Sabbath albums 1970-1983.Vegetarian.The song Sweet Leaf got its name from a brand of cigarettes that he bought in Dublin, Ireland.