David was a wonderful man. He backed my first start-up and went on to back Open Democracy. Mathematical physicist turned super-geek then philanthropist. (Loved the Psion in its day, too!).
Very sorry to learn that the magnificent David Potter died on Sunday evening. A pioneering mathematical physicist, he founded Psion, created the first hand-held organizer and oversaw Symbian, the standard mobile operating system. He was a wonderful philanthropist and supporter of @opendemocracy.net