[2] In his Iowa State dormitory in 1975, Rasmussen began to develop and playtest an espionage simulation with his friends, and the next year he wrote to TSR to see if the game could be published; he received a response letter from Mike Carr wishing to review the game, and by the next year the simulation had the working title of Top Secret, which was eventually accepted for publication in 1978.
Allen Hammack was assigned to the project as an editor, and worked with Rasmussen on rules clarifications and editing.
[3]: 12 In 1982, at the age of 25, Rasmussen was hired by TSR as a fulltime employee to write adventures for the Basic and Expert Sets of Dungeons & Dragons.
[4] Rasmussen also authored several other role-playing game related titles such as Top Secret Companion.
[5] Jackie and Merle Rasmussen wrote a two-part adventure using the D&D Expert Setrules titled "Tortles of the Purple Sage" that appeared in Dungeon #6 (July/August 1987) and #7 (September/October 1987).