Although many companies are seemingly practicing service design, or elements of the discipline, there are few who are wholly brand themselves as service designers. However, Frontier Design recently announced they were the first service design firm in the US... so I am eagerly awaiting more information from this very interesting group of people! What an exciting development for Service Design! Head Service Designer Joel Bailey echoed my opinion.
Thanks to Elliot's comment, I have discovered Pink*, a service design company based in Pennsylvania, founded in August 2008. Although their website is not completed, it is simple, informative and beautiful. I love that 'SEE' is part of their process: "we work with you and your stakeholders to understand the problem space from varied perspectives." I really look forward to learning more about Pink*!