[2] David Ritchie was working for Simulations Publications, Inc. (SPI) when it was taken over by TSR in March 1982.
[3]: 14 He designed The Omega War in his final months at SPI,[4] before leaving in late 1983 to work for Coleco.
[3]: 14 Ritchie, along with Jon Pickens, David "Zeb" Cook, Harold Johnson, Rick Swan, and Ed Carmien, co-wrote the adventure module OA2 Night of the Seven Swords.
[5] Ritchie and Dave Arneson wrote a series of four adventures that further detailed the world of Blackmoor which Arneson had created, and they were published by TSR as DA1: Adventures in Blackmoor (1986), DA2: Temple of the Frog (1986), DA3: City of the Gods (1987) and DA4: The Duchy of Ten (1987).
[3]: 388 Ritchie wrote the 1991 book Connecticut: Off the Beaten Path with his wife, Deborah.