Dennis Muren (USA) won the Academy Award for Visual Effects a total of six times between 1983 and 1994. He has also received two Special Achievement Awards, in 1981 for Star Wars: Episode V - The Empire Strikes Back (USA, 1980) and in 1984 for Star Wars: Episode VI - Return of the Jedi (USA, 1983). He also received the Technical Achievement Award in 1982 "For the development of a Motion Picture Figure Mover for animation photography". In addition, Muren holds the record for the most Oscar nominations for visual effects. He has been nominated on 13 occasions, the first being in 1982 for Dragonslayer (USA, 1981) and the most recent being in 2006 for War of the Worlds (USA, 2005).