William Geoffrey Steer (born 3 December 1969) is a British guitarist and co-founder of the extreme metal band Carcass.

According to various interviews, it was at this time he was exposed to hard rock and heavy metal in the form of Motörhead, Deep Purple, Black Sabbath, UFO, Iron Maiden, Led Zeppelin and so on, followed by lesser-known NWOBHM artists such as Raven, Tank and Venom.

These years saw Steer begin playing electric guitar and also becoming one of the earliest tape traders in the UK, immersing himself in the embryonic underground death metal scene.

After the demise of Carcass he moved to Australia and developed a passion for blues music, teaching himself harmonica and slide guitar.

Steer now plays guitar in the band Gentlemans Pistols and also performed with a new wave of British heavy metal veterans Angel Witch.

[11] Steer plays old Gibson Les Paul guitars (primarily Juniors and Customs), and uses vintage fifty-watt Marshall amplifiers.