"Mobile First" is a mantra - but yes, mobile really nowadays comes first as more and more computing and UX takes place on the go. I've got a bunch of mobile concepts and interaction designs - systems, devices, features and experiences - in my portfolio. Have a look!
My experience design looks up at the user, and starts from the user.
User-centered design has its roots in psychology and the theory of performing arts - identification to the user. You. A UX designer's toolkit talks about personas as a starting point, but I like talking about real people and their needs. Yours, mine, those of James, Meredith, Kathy, David, Janne, Pekka, Katri and all the others.