"Hans Reiser is waiting for me, standing on the other side of an imitation-wood table. The room is small, the concrete walls bare. A guard locks the steel door from the outside. There is no sound. Reiser is wearing the red jumpsuit of a prisoner in solitary confinement, though he has been allowed to meet with me in this chilly visiting room. There was a time when he was known as a cantankerous but visionary open source programmer. His work was funded by the government; he was widely credited (and sometimes reviled) for rethinking the structure of the Linux operating system. Now he is known as prisoner BFP563."