Einstein

He never accepted the uncertain randomness of the quantum theory. He thought it, if not wrong, at least incomplete. Quote: "Quantum mechanics is certainly imposing, but an inner voice tells me that it is not yet the real thing. The theory says a lot, but it does not really bring us any closer to the secrets of the Old One. I, at any rate, am convinced that He does not play dice."
(from "Einstein" by Walter Isaacson)