Jan Chipchase tours the world looking at how people use mobile phones in their everyday lives and, more broadly, how people live.
"This is my office, my workspace," he says, pointing to a map of the world. In the last 12 months he has visited 15 countries, carrying out eight full-scale research projects.
Mr Chipchase's focus is on the uses to which people put their phones; where they keep them, how they answer them, and a million other details about our relationships with these devices that have helped shape our world. On the street, in homes, in the office, in pockets, handbags, at the marketplace, and in the community - Mr Chipchase tries to put mobile phone use into the context of the culture and landscape he is in.