Question: Mutants in Orbit is a role-playing game authored by which British designer/publisher? 
Context: The Palladium Fantasy Role-Playing Game (often shortened to Palladium Fantasy or PFRPG) is a game produced by Palladium Books.  It is set in the Palladium world (use of the unofficial name "Palladia" is discouraged by the publisher) some 10,000 years after a great war between the elves and dwarves.  First published in July 1983 as "The Palladium Role-Playing Game", the "Palladium Fantasy Role-Playing Game" saw a second edition in April 1996.  The two are largely compatible, though the second edition uses a later iteration of Palladium's ruleset to be more compatible with the rest of their Megaverse. Aslan was a highly-regarded British role-playing game fanzine that was published in Brighton and subsequently York in the late 1980s and early 1990s.  It ran for 13 issues and many of them had sub-zines included.  The title refers to both a character in The Chronicles of Narnia and an alien race in the Traveller role-playing game.  The fanzine grew out of a long-running fantasy role-playing game which took place at the University of Sussex.  The editor and publisher was Andrew Rilstone, who was initially assisted by Martin Wykes. Michael Alyn Pondsmith (born April 14, 1954 ), typically credited as Mike Pondsmith, is an American roleplaying, board, and video game designer.  He is best known for his work for the publisher R. Talsorian Games, where he developed a majority of the company's role-playing game lines since the company's founding in 1982.  Pondsmith is credited as an author of several RPG lines, including "Mekton" (1984), "Cyberpunk" (1988) and "Castle Falkenstein" (1994).  He also contributed to the Forgotten Realms and Oriental Adventures lines of the "Dungeons & Dragons" role-playing game, worked in various capacities on video games, and authored or co-created several board games.  Pondsmith also worked as an instructor at the DigiPen Institute of Technology. James Wallis is a British designer and publisher of tabletop and role-playing games. Trias is a board game authored by Ralf Lehmkuhl.  It is distributed by Rio Grande Games, Tilsit Editions and Gecko Games. Forgotten Realms is a campaign setting for the "Dungeons & Dragons" ("D&D") fantasy role-playing game.  Commonly referred to by players and game designers alike as "The Realms", it was created by game designer Ed Greenwood around 1967 as a setting for his childhood stories.  Several years later, Greenwood brought the setting to the "D&D" game as a series of magazine articles, and the first Realms game products were released in 1987.  Role-playing game products have been produced for the setting ever since, as have various licensed products including sword and sorcery novels, role-playing video game adaptations (including the first massively multiplayer online role-playing game to use graphics), and comic books.  The Forgotten Realms is one of the most popular "D&D" settings, largely due to the success of novels by authors such as R. A. Salvatore and numerous role-playing video games, including "Pool of Radiance" (1988), "Eye of the Beholder" (1991), "Baldur's Gate" (1998), "Icewind Dale" (2000) and "Neverwinter Nights" (2002). Mutating Mutants is a role-playing game adventure published by TSR in 1990 for the "Marvel Super Heroes" role-playing game. Mutants in Orbit is an adventure and sourcebook for the "After the Bomb" and "Rifts" role-playing games, authored by James Wallis and Kevin Siembieda.  It was released by Palladium Books in March 1992.  The book deals with life of space colonies.  The setting is on the same time scale as the "After the Bomb" and "Rifts", only from the space colonies' point of view, but is in no way limited to that use. PO'ed is a 1995 video game authored by Any Channel and published by Accolade.  It features a cook of a destroyed spaceship marooned on an alien world. Larn is a roguelike computer game authored by Noah Morgan in 1986 for the UNIX operating system.  Morgan's original version of "Larn" remains part of the NetBSD games collection.
Answer: James Wallis