John D. Harris is a well-known computer programmer, hacker and author of some classic 1980s Atari computer games.His love for the Atari 8-bit computers led him to creating several popular games, perhaps most of all Frogger, which by the end of development had been written from scratch, twice. The reason for this is that his entire back catalogue of development tools and libraries he had developed were stolen at a game developer conference at which he was presenting.