There is more than one artist with this name: 1) Heavy Metal band from Los Angeles
2) Jameson (aka Jamieson) is a UK Garage producer and famous for the 2001 hit "Urban Hero". More info on #1 (the band):
Armed with the attitude of their predecessors, Jameson’s bone crushing groove is the product of five well educated masters with a chip on their shoulder, determined to shred their way onto the metal scene and create some serious waves for years to come.

Read more about Jameson on Last.fm.