Writer Bill Coffin made contributions to several of Palldium's game series, including the book Heroes Unlimited, written by who?
Bill Coffin: Bill Coffin is a writer of novels and role-playing games in the fantasy and science fiction genres. Bill Coffin:  Perhaps best known for his work at Palladium Books from July 1998 through May 2002, he made significant contributions to several of Palladium's game series, most notably "Palladium Fantasy", but also "Heroes Unlimited" and "Rifts", and created his own game, "Systems Failure". Heroes Unlimited: Heroes Unlimited is a superhero role-playing game written by Kevin Siembieda and first published by Palladium Books in 1984.
Kevin Siembieda