The actors who physically portrayed Darth Vader on screen were:
* David Prowse for most of the original trilogy, except for the lightsaber duel in "Return of the Jedi" where he was replaced due to a scheduling conflict.
* Sebastian Shaw in "Return of the Jedi" for the scene where Vader's mask is removed.
* Bob Anderson in "Return of the Jedi" for the lightsaber duel with Luke.
So, while Jones's voice is instantly recognizable, the physical performance of Darth Vader was done by other actors.