These include David Conyers, Matthew Costello, Larry DiTillio, Paul Fricker, David A. Hargrave, Rob Heinsoo, Keith Herber, Jennell Jaquays, Katharine Kerr, Reiner Knizia, Charlie Krank, Robin Laws, Penelope Love, Mark Morrison, Steve Perrin, Sandy Petersen, Ken Rolston, Ken St. Andre, Jonathan Tweet, John Wick, and Lynn Willis; among others.

In 1980, the company officially incorporated as Chaosium Inc. That year, Stafford and Lynn Willis simplified the RuneQuest rules into the 16-page Basic Role-Playing (BRP).

[8] In 1998, following the financial failure of the collectible card game Mythos, Greg Stafford resigned as Chaosium president and left the company, along with Sandy Petersen (although they both remained shareholders).

Long-time employees and part-owners Charlie Krank and Lynn Willis remained at Chaosium as President and Editor-in-Chief respectively, continuing on with Call of Cthulhu as the main product line.

Problems and delays fulfilling the Kickstarters for the 7th edition of Call of Cthulhu led Stafford and Petersen to return to active roles at Chaosium in June 2015.

As part of its financial reorganization, the new management closed the company office and warehouse in Hayward, California, ending Chaosium's long association with the San Francisco Bay Area.

[14] On April 2, 2019, Chaosium acquired the rights to the 7th Sea product line (both Second Edition and Khitai Kickstarters) from John Wick, including back stock of books published so far.

[15] On November 30, 2019, Chaosium acquired the rights to produce a role-playing game based on Ben Aaronovitch's Rivers of London urban fantasy novels.

[23] Lowder had previously served as a consultant for Chaosium, helping the company and freelancers resolve payment and contract problems with past fiction projects.