http://blog.chess.com/qtsii/chess-great---akiba-rubinstein-intro
If you want to play a grandmaster, the easiest way is to be a grandmaster (and compete at tournys). For people who can't get anywhere near the GM level, the best chance to play against a GM is in a simul
Who was he? Was he a human? Is he/she alive!? I don't know but I have seen games where it will say " Rubinstein Variation".... ??? I have no idea.
And, how do you play a grandmaster, if one wishes to play grandmaster?