Stephen Bier, formerly known by his stage name Madonna Wayne Gacy and by the nickname Pogo,[1] is an American musician who was the keyboard player for Marilyn Manson from 1989 to 2007.

Bier is responsible for much of the Qabalistic and numerological meanings behind Manson's albums.

[3][page needed] He did not contribute to Manson's album Eat Me, Drink Me, having been replaced by Chris Vrenna.

In 2007, Bier filed a lawsuit against Manson for unpaid "partnership proceeds".

[4] Manson filed a counter suit against Bier, accusing him of breach of contract.