Lojur served at the helm aboard the Excelsior during its three-year mission cataloging gaseous planetary bodies in the Beta Quadrant, from 2290 to 2293. He also served at the helm during the battle at Khitomer against Klingon General Chang in late-2293. (Star Trek VI: The Undiscovered Country; VOY: "Flashback")
Lojur was played by actor Boris Lee Krutonog. It should be noted that his accent was far thicker in "Flashback" than in The Undiscovered Country.
According to the Star Trek: The Lost Era novel The Sundered, Lojur was Halkan, and was exiled by his village elders in 2281 for violating their strict code of pacifism when he used deadly force against invading Orion pirates. A landing party from the USS Reliant, led by Commander Pavel Chekov, finds the young exile and takes him back to the ship.