Shannon was pretty ridiculous. He basically invented information theory, proved all the major theorems involved, and applied it to communications and error-correction codes. If you work in RF you can't do much without encountering his work. (It did take a while before anyone figured out how to get close in practice to the limits he proved, though)
And before his work on information theory, his master's thesis showed that Boolean algebra could be used to design digital circuits and invented logic gates:
