Mark Riley is a video game developer of unknown origin, possibly either American or English. He developed Sonix for the Commodore Amiga. The program was used by many software developers to create music and sound for the Commodore Amiga, but most of the time, Mark went uncredited. His only known video game credit is the Amiga version of A-10 Tank Killer. There is also a Mark Riley credited for programming computer games, but it is unknown if this is the same person.
As stated above, Mark used his own music software, Sonix. The software required its user to enter music on a musical staff.