eek! Why are you people so obsessed with movie stars? What positive input had Hayden Christensen? (he only ruined the series with his whiny Anakin) And with all respect: David Prowse only walked in the costume... better take Bob Anderson, who was the stunt (also fencing master) during Vader's fights.

OK, big plus for you for listing Ralph McQuarrie, but you could also mention people like Joe Johnston (provided the final designs for Yoda and Boba Fett) and Nilo Rodis-Jamero, who were also important in design process.
If Dennis Muren, then perhaps also John Dykstra, who designed and built the first computer-controlled motion control system for "Star Wars".