Howard G. Kazanjian = Return of the Jedi
Rick McCallum = Special Editions of above, Episodes I, II, and III (not worth the space to mention by name).
Strange coincidence it seems.
If you've watched any interviews with McCallum, I think you'd find he is the one who is terminally obsessed with CG. When he's not talking about CG, or how he was used as the model for nearly every CG character (this stormtrooper, that X-wing pilot, etc.) he's using GL to brown his nose, or going on and on for hours repeating "this is f--king grim... this is f--king grim".
Of course it doesn't relieve Lucas of responsibility, but I can't help but believe McCallum is largely responsible for the catastrophe that has come to Star Wars. I also have to wonder what things would have been like if Gary Kurtz had remained the producer, or if he at least had a producer that would tell him when he had a bad idea, instead of constantly proclaiming him as a genius no matter what.