Question: Jon MacLellan is best known for his time while working for an American video game development company founded in what year?
Sentence (from "Epic Games"): Founded in 1991, it is best known for the development of Unreal Engine technology, which has powered its in-house "Unreal", "Gears of War" and "Infinity Blade" series as well as many other games, and has been awarded by Guinness World Records as the "most successful video game engine".
Relevant evidence: Yes