8. George Lucas

From Luke Skywalker's light sabre to Darth Vader's Death Star, the Star Wars franchise is one of the defining science fiction works of the later 20th century. George Lucas' prolific imagination has already inspired two generations of scientists and engineers to push the envelope of technology. By introducing computers into the filmmaking process, he changed the way movies are made, and the way we all see the future. Surprisingly, many fictional technologies from "a long time ago in a galaxy far, far away" are now becoming reality.