George Lucas

George Lucas is the creator of Star Wars, and a controversial figure in that fandom for two reasons.

Firstly, he directed the Prequel Trilogy, which is riven with problems at the very least, and is unbearable to some fans. This is a subject of some debate, but there are certain things in it that most fans agree should not have ever seen the light of day (such as all of the romantic scenes).

Secondly, his policy on the Star Wars Expanded Universe is worrying in two different ways. The screening process for letting writers play around in the universe is very loose, and therefore there aren't many books in it which are universally liked (though, inversely, neither are there many which are universally hated, though there does seem to be more bad than good). And Lucas has a tendency to ignore the EU outright when assembling new works, which has some sections of the fandom extremely worried at the possibility of Movies 7, 8, and 9--specifically that they might throw out beloved bits of the EU wholesale and replace them with unsavory and yet very, very canon things. His position on the EU also makes the nature of Star Wars canon a little confusing; according to him, the films are the only "real" canon, or at the least the films and EU are two different, mutually-exclusive canons. Fans seem to disregard this, but it can make determining what is or isn't canon a little tricky.