"It was always supposed to be a secret, but I finally told George (Lucas) I didn't think it was fair any more," Hamill told Starlog magazine, referring to the legendary director and producer. "Bob worked so bloody hard that he deserves some recognition. It's ridiculous to preserve the myth that it's all done by one man."
Unfortunately, he still seems to have been overshadowed over the decades. He also worked on other movies such as The Lord of the Rings trilogy, two James Bond films, and The Princess Bride.
I tip my nerd hat to you, Mr. Anderson. You made Darth Vader even more fearsome and cool.
(h/t Science Fiction.com)