Ben Burtt signed CV photo and card. Obtained through purchase and trade. Mr. Burtt was responsible for too much to mention.  Please check his IMDB credits.  Mr. Burtt really has been with all things Star Wars related mostly as sound designer, editor, mixer and he even created some Ewokese Language...Yes, he worked on all the films. But courtesy of someone who knows more, I was told he did this: Red 11/Trooper / Naboo Courier/Scout trooper who says “Freeze!” in ROTJ, also Vader’s breathing