there are quite a handful of companies practice six sigma, including nokia, samsung, citibank, bank of america....etc
but now many firms also adopt six sigma with Lean.
working in Six sigma line is tough...majority of the HR hiring Six sigma ppl dont really recognise its not totally a QA job, but its a strategic tools which can apply to new product develop and strategic management approach.
I have been spending long time to tell the HR what the actual job description supposed to be for a Six Sigma black belt...they should priority the project skills first, the industry experience in a particular field is secondary, because the Six sigma project could be a computing system implementation , business transaction,production improvement or marketing strategy formulation...but many are too focus on the industrial skills rather than the project skills, so end up many SS projects in Asia are not up to standard because the project leaders are too focus on the particular field and the potential of the SS cannot be fully utilise within the organisation