Gimor was a Klingon member of Klahb, and in 2379 participated in the attempted takeover of the Federation Embassy on Qo'noS. He was hired as a kitchen steward at the embassy sometime in the month prior to the takeover.
Early in the takeover attempt, Worf was able to kill two invaders and capture a third. Gimor was sent along with Dohk to aid in the floor-by-floor search of the embassy for Worf. However, they never encountered him and eventually Worf was able to regain control of the security system and flood the building with anesthizine gas knocking everyone unconcious. Along with all of the surviving members of Klahb except for Rov, Gimor was captured and held by the Klingon authorities. (TNG novel: A Time for War, A Time for Peace)