From the author biographies in Ghostbusters: Who Ya Gonna Call?:
Fritz contributed the Ghostbusters Omnibus Timeline. Fritz was a pretty active gamer with a small circle of friends throughout the late 80's and most of the 90's (before some of them moved away and the demands of having Real Life Jobs took their tolls on everyone else). They played D&D at first (like everyone else) but moved on to other things, including several of the Palladium systems (their fantasy RPG and Rifts both spawned campaigns lasting a couple of years apiece), Mayfair Games' DC Heroes, dalliances with the World of Darkness, and yes, two separate runs of West End Games Ghostbusters International. Technically, they started with Ghostbusters: A Frightfully Cheerful Role Playing Game in 1986, about the same time The Real Ghostbusters was coming onto television and blowing their minds. "Kids today just don't understand how groundbreaking it was for it's time," said Fritz, "when before that pretty much every show was exactly like Scooby Doo, the Smurfs, or Filmation's awful Ghost Busters cartoon." A lot of the Ghostbusters fan fics Fritz has posted at his site are based on ideas they had both in the GBI RPG and the others.