Bruce Lee without a doubt. It depends on your definition of influential of course. I can remember watching Bruce Lee movies when I was a kid and thinking "Wow" I wish I could do that. He had an incredible charisma and the camera loved him. Once in a while I'll pull "Enter the Dragon" out of the closet and watch it for the hundredth time still in awe of his incredible movement and energy. This is before they had those incredible special effects too. My first interest in Martial Arts started after seeing Bruce. May he Rest in Peace.