Date of Birth: 
Place of Birth: Gdynia, Pomeranian Voivodeship, Poland
About Mateusz Śmierzchalski
- Mateusz Maurycy Smierzchalski (born 18 July 1982, Gdynia, Poland), stage name Havoc, is a Polish heavy metal musician.
- He is best known for being the rhythm guitarist, lead guitarist, and backing vocalist for Behemoth.
- Since 1999 he is leading guitarist of the sludge-doom metal band Blindead.Mateusz Smierzchalski is endorsed by Mayones.
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