Piotr Wiwczarek

Piotr Wiwczarek (born 22 October 1965 in Poland in Olsztyn), also known as Peter, (ex nickname Behemoth) is a Polish guitarist and vocalist who is the frontman for the death metal band Vader, although joined the band as their bassist. He has also collaborated with Kazimierz "Para" Paraszczuk on his tribute album, Bandid Rockin', and is the producer of several of Vader's releases. He is also the founder and guitarist of a side-project, named Panzer X.

Piotr also became a producer for the first time in 1999 when producing the Polish death metal band Decapitated's first release, Winds of Creation.