I've known about them since mid-2000 but only became a fan recently, around April or May. I saw this article from Ultimate Guitar about the top 10 heaviest riffs and their song, Backbone, at no. 4. So I watched the Youtube video and was instantly hooked.

Wikipedia describes them as a blend of tech death, prog metal, thrash, and groove metal. Joe and Mario Duplantier have dual French and American citizenship. Their mother was American and hailed from Wisconsin.