He had several roles in all original Star Wars movies as both Imperials and Rebels, and even in TPM as Terence Stamp's stand-in.
His body was also cast as Han Solo's in carbonite: They cut out his face and glued Harrison Ford's face in.
I met him at a convention in Denmark in 2011. I learned that he had been double for Anthony Daniels also. I asked him if he didn't get any screen time in the C-3PO suit or the Boba Fett suit, and I remember that he was insistent that he hadn't got any screen time as any of them, contrary to what Wookiepedia says about him.