I work in Microsoft Research at their lab in Cambridge in the Socio-Digital Systems Group. My current research interests are social software and mobile media. Before Cambridge I worked in the Social Computing Group in Redmond on aspects of shoulder to shoulder computing - that is building applications for several users to interact with together in the same room. Before that I worked on online virtual worlds, systems architecture, and formal methods. I hold a doctorate in Theoretical Computer Science from The University of Sussex. I've started keeping a blog: http://dumbledad.wordpress.com/; and I try to keep my flickr photostream and del.icio.us bookmarks fairly up-to-date.