Designing for Interaction: Creating Innovative Applications and Devices (2nd Edition) (Voices That Matter)
Dan Saffer (San Francisco) is a founder and principal of Kicker Studio, a San  Francisco-based design consultancy for consumer electronics, appliances,  devices, and interactive environments, specializing in touchscreens and  interactive gestures. In his "spare" time, he curates a site called No Ideas But In  Things that collects physical interfaces for design inspiration. He also oversees  a wiki for the collection of new interaction paradigms called Interactive  Gestures.