Richard was well-known for his work in heroic fantasy including his Red Sonja novels, and his Simon of Gitta series combining the Cthulhu Mythos with Gnosticism. For Chaosium, Richard contributed stories to several Mythos fiction anthologies including The Yith Cycle, The Necronomicon, and The Book of Eibon. The first collection of his Simon of Gitta stories were published by Chaosium as The Scroll of Thoth in 1997.
Richard also wrote 'The Cthulhu Mythos in Mesoamerican Religion', published in 1983's The Cthulhu Companion. Described by the Vintage RPG Podcast as "a fascinating exercise in comparative religion, revealing the secret truth of the Cthulhu Mythos lurking in the hearts of human faiths", we're pleased that this influential essay is returning to print again as part of our Call of Cthulhu Classic line for the game's 40th Anniversary.
Condolences from Chaosium to Richard's family and friends.
A more detailed obituary is here.