[6] His first published games were Islandia and Time Lords, which he made for the BBC Micro in 1983 with programmer Andy Greene, a school friend.
[7][8][9] Gollop subsequently upgraded to a ZX Spectrum and began creating video games like Nebula in BASIC.
[6][10] Under the Mythos name, the Gollop brothers designed and developed computer games such as Laser Squad, UFO: Enemy Unknown and X-COM: Apocalypse.
[6] It was with UFO: Enemy Unknown (released in North America under the name X-Com: UFO Defense) that he first beginning making video games directly for the MS-DOS and later Microsoft Windows operating system personal computers that at the time would be sold primarily in the United States.
[13] The Gollop brothers developed only one other game, Rebelstar: Tactical Command, before he moved to Bulgaria with his wife in 2006.
[14][15] After moving to Bulgaria, Gollop began working for Ubisoft in Sofia as a game designer.
[6] He was promoted quickly to producer, eventually leading the development of Tom Clancy's Ghost Recon: Shadow Wars for the Nintendo 3DS.