Short answers, pulled from the story.
Greg Stafford opened the doors to his new company in 1975 from a small apartment near the Oakland Coliseum. He named this venture The Chaosium blending the word chaos with coliseum to reflect both his living situation and his ambitions.
Chaosium officially incorporated as an entity called Chaosium Inc. during the year 1980. That same year Greg Stafford and Lynn Willis simplified the complex rules of RuneQuest into a sixteen-page document known as Basic Role-Playing or BRP.
Kerie Campbell-Robson published Hawkmoon in 1986 which became one of the first role-playing games led by a female designer. Later that year Ghostbusters appeared on shelves thanks to Sandy Petersen Lynn Willis and Greg Stafford working together.
The late 1990s brought significant challenges for Chaosium after the financial failure of their collectible card game Mythos. By 1998 Greg Stafford resigned from his position as president alongside Sandy Petersen though both remained shareholders.
Operations moved to Ann Arbor Michigan utilizing fulfillment houses for distribution instead of maintaining physical inventory locally when the organization closed its office and warehouse located in Hayward California. This occurred later that year at Gen Con 2015 following delays fulfilling Kickstarter rewards for the seventh edition of Call of Cthulhu.
The 26th of October 2021 marked Moon Design Publishing forming partnerships with Black Monk Games Poland creating The Chaosium Group to manage combined operations. This final growth step followed acquisitions of Cthulhu Britannica and World War Cthulhu earlier that month.