After completing an interview and some test freelance editing assignments, Mohan was hired by TSR as part of a three-man staff.
[3][5]: 13 Mohan also worked on other TSR projects: he was the co-designer of the TSR board game Food Fight,[6] performed managerial duties for Strategy & Tactics and Amazing Stories magazine,[3] served as editor and "general handyman" for the Unearthed Arcana rule book, authored the Wilderness Survival Guide rulebook,[5]: 17 and edited Saga of Old City (Gary Gygax's first novel).
Based on an outline by Gygax, the trilogy included Planet in Peril (1987), Chase into Space (1988) and The Ultimate Prize (1988).
Luke Gygax, son of Gary, later wrote, "[He] left TSR and went to work with my Dad because he believed in him and his capabilities.
[citation needed] In 1996, TSR ran into financial difficulties, and was taken over by Wizards of the Coast (WotC) the following year.
[7] He was then promoted to managing editor during the second half of the design stage (with Julia Martin finishing the project).