Kevin Siembieda (born April 2, 1956) is an American artist, writer, designer, and publisher of role-playing games, as well as being the founder and president of Palladium Books. Palladium Books, founded in southeast Michigan, claims to be the first to implement a role-playing system intended to work for all genres and to introduce the perfect-bound trade paperback format to the RPG industry. Some of the role-playing games Siembieda helped produce include Teenage Mutant Ninja Turtles & Other Strangeness (1985), Robotech RPG (1986), After The Bomb (1986), and Rifts (1990). Siembieda is also an artist, best known for occasionally illustrating Palladium Books' products. In 1978, he started the now-defunct Megaton Publications in Detroit, publishing a digest style title called A+ Plus and several other titles. He also contributed art and cartography to several early Judges Guild products (for both their Traveller and Dungeons & Dragons lines).

Erick Wujcik (January 26, 1951 – June 7, 2008) was an American designer of both role-playing games and computer role-playing games, and co-founder of Palladium Books. Wujcik started off as head of the gaming society at Wayne State University, and then as a computer columnist for The Detroit News from 1979 to 1981, where he wrote their weekly Computer Column. That served to be a springboard for him to co-found Palladium Books and work on developing numerous role-playing games and supplements for such gaming settings as Teenage Mutant Ninja Turtles & Other Strangeness, Palladium Fantasy Role-Playing Game, Amber Diceless Roleplaying Game, Paranoia, Robotech, Rifts, and many others. Wujcik was also the director of the Detroit Gaming Center, and founder of the gaming conventions known as Ambercon. In 1997 he went to work for Sierra Studios, and was lead game designer on the game Return to Krondor. He also served as a game designer at Outrage Entertainment for the game Alter Echo. Wujcik served as Chief Editor of Amberzine, a fanzine for the Amber Diceless Roleplaying Game, which has published the work of such notables as Ray Bradbury, Henry Kuttner, and Roger Zelazny, and which published its last issue in 2005. He has also been an editorial contractor for the Detroit Historical Museum, and gives seminars on a wide range of topics related to the writing, design and development of role-playing games. From 2004 to 2006, Wujcik was Game Design Studio Manager for UbiSoft China, in Shanghai. Until his death, in June 2008, Wujcik was Senior Game Designer / Writer for Totally Games, north of San Francisco.