Perrin and Lester Smith designed the Sovereign Stone RPG (1998) based on the trilogy of Sovereign Stone books, and Margaret Weis formed the company Sovereign Press with herself as CEO to publish the RPG [REF].
Don Perrin, Michael Cosentino and Kathyrn Plamback purchased the two US wargaming magazines, "The Courier" and "MWAN" and combined them into the Historical Miniature Gamer Magazine in 2005 [REF].