Sega

Sega (originally Service Games) is the company that brought you Rez under their United Game Artists label. Other projects from Sega include the classic Sonic the Hedgehog franchise, Billy Hatcher, Samba de Amigo! and Super Monkey Ball. They also made Space Channel 5 under the United Game Artists label, a nod to which is made in Rez by having one of Swayzak's forms be a Morolian. (It is really hard to get, though!)