Here is a list, in no particular order, of Service Designers I found based on a Linkedin search of people with the word "service designer" in their job title. 

Obviously, many more people practice Service Design in some way or another without using this title in their job title, as the term is lesser known in Switzerland than in the UK, for example.

Additionally here is the list of the founders of the Swiss Service Design Network: 

Check out all the questions about Service Design in Switzerland.