Josh Clark is a designer, developer, and author specializing in mobile design strategy and user experience. He's author of the O'Reilly books "Tapworthy: Designing Great iPhone Apps" and "Best iPhone Apps: The Guide for Discriminating Downloaders." Josh's outfit Global Moxie offers workshops and consulting services to help creative companies build tapworthy iPhone apps and effective websites.
I know there is a lot of debate as to whether service design is not just IxD. I don't are (anymore). The reality is that even IxD is an emergent cross-disciplinary field that at earlier points in its history could be totally confused for previously existing design disciplines and engineering practices. But considering the size and breadth of this community with various affinities it is clear as Morpheus said, "We are here." That's sorta how I see Service Design (they need an abbreviation; is SD good enough? for now it will be).