Question: Which British designer and publisher of tabletop and role-playing games coauthored Mutants in Orbit with Kevin Siembieda?

full_context: Document 1: Titan (game): Titan is a fantasy board game for two to six players, designed by Jason B. McAllister and David A. Trampier. It was first published in 1980 by Gorgonstar, a small company created by the designers. Soon afterward, the rights were licensed to Avalon Hill, which made several minor revisions and published the game for many years. "Titan" went out of print in 1998, when Avalon Hill was sold and ceased operations. A new edition of "Titan", with artwork by Kurt Miller and Mike Doyle and produced by Canadian publisher Valley Games became available in late 2008. The Valley Games edition was adapted to the Apple iPad and released on December 21, 2011.
Document 2: James M. Day: James M. Day is an American game designer best known for military based board games, computer games, card games, and miniature rules. He is also an accomplished historian and military weaponry subject matter expert.
Document 3: Kerbal Space Program: Kerbal Space Program (KSP) is a space flight simulation video game developed and published by Squad for Microsoft Windows, OS X, Linux, PlayStation 4, Xbox One, with a Wii U version that was supposed to be released at a later date. The developers have stated that the gaming landscape has changed since that announcement and more details will be released soon. In the game, players direct a nascent space program, staffed and crewed by humanoid aliens known as "Kerbals". The game features a realistic orbital physics engine, allowing for various real-life orbital maneuvers such as Hohmann transfer orbits and bi-elliptic transfer orbits.
Document 4: List of Traveller Books: "Traveller" is an Origins Award winning science fiction role-playing game published by Game Designers' Workshop in 1977. In the Third Age of the Imperium interstellar travel has become possible and Humaniti has met other starfaring races. 2300 AD portrayed humans as technologically advanced, but having a level of civilization not very far above the present day. Later publishers introduced additional material along the Official Traveller Universe (OTU) timeline. In 2008, Mongoose Publishing reintroduced GDW's popular look and indexing feature separating publications into familiar Books, Supplements, and Adventures.
Document 5: Francis Tresham (game designer): Francis Tresham is a United Kingdom-based board game designer who has been producing board games since the early 1970s. Tresham founded and ran games company Hartland Trefoil (founded 1971), a company well known for its "Civilization" board game, until its sale to MicroProse in 1997. His "1829" game was the first of the "18xx" board game series and some of his board games have inspired Sid Meier computer games such as "Railroad Tycoon".
Document 6: The Morrow Project: The Morrow Project is a science fiction role-playing game created by Kevin Dockery, Robert Sadler and Richard Tucholka and published by TimeLine Limited. It is set after a devastating nuclear war. It was first released in the 1980s, and it still has a loyal following. The fourth edition was released as of December 15, 2013 by Chris Garland, the head of Timeline Limited.
Document 7: Mutants in Orbit: 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.
Document 8: Jim Smith (author): Jim Smith is multi talented British author, illustrator and designer who is behind the gift and card range, Waldo Pancake, Head of Design for franchise chain Puccino Coffee as well as creator of the award winning children's series Barry Loser. "I am still not a Loser," Jim's second book in the Barry Loser Series won the Roald Dahl Funny Prize in 2013 for funniest book for children aged 7–14.
Document 9: Matt James (game designer): Matt James (born 1981) is an American game designer and a decorated veteran of the United States Army. As a game designer, James is best known for his online and print works for the "Dungeons & Dragons" fantasy role-playing game published by Wizards of the Coast, "Pathfinder" role-playing game by Paizo, and Privateer Press. He has also designed game content for Wolfgang Baur's Kobold Press (formerly Open Design LLC). In 2012 James won an ENnie Award for "" and has been nominated for several Origins Awards. In 2014, James won an ENnie Award for "".
Document 10: Jim Bambra: Jim Bambra (born 1956) is a British designer and reviewer of fantasy roleplaying games (RPG), and a former company director. He is particularly known for his contributions to "Dungeons and Dragons", "Fighting Fantasy", "Warhammer", and "" which was based on the "Star Wars" films. Later he became head of design at MicroProse, then managing director of Pivotal Games, a publisher of video games including "".
Document 11: John Wall (inventor): John Wall (born 1932 in Crayford, Kent) is an English design engineer, amateur astronomer, amateur telescope maker and member of the British Astronomical Association, now living Coventry England.
Document 12: Rifts (role-playing game): Rifts is a multi-genre role-playing game created by Kevin Siembieda in August 1990 and published continuously by Palladium Books since then. "Rifts" takes place in a post-apocalyptic future, deriving elements from cyberpunk, science fiction, fantasy, horror, western, mythology and many other genres.
Document 13: The Mechanoid Invasion: The Mechanoid Invasion (and its source books, supplements and sequels) was the first role-playing game from Palladium Books, conceived and written by Kevin Siembieda, with contributions from Erick Wujcik.
Document 14: Palladium Books: Palladium Books is a publisher of role-playing games (RPGs) perhaps best known for its popular, expansive "Rifts" series (1990–present). Palladium was founded April 1981 in Detroit, Michigan by current president and lead game designer Kevin Siembieda, and is now based in Westland, Michigan. The company enjoys the support of a small but dedicated fanbase who praise its various game series for their innovative settings and ease of adaptability to various personal preferences, play styles, and power levels.
Document 15: James Wallis (games designer): James Wallis is a British designer and publisher of tabletop and role-playing games.
ground_truth: James Wallis