Taking into account the butterfly effect, I guess Roger Penrose would have influenced me the most. At first I was into physics and taught myself some calculus to understand it better; but it was more a tool than an end in itself. Then, at about 14, I read The Emperor's New Mind and was totally blown away by the ideas and proofs around Gödel's and Turing's work. Previously I had no idea the human mind could be so powerful!

It definitely pushed me into mathematics, and to this day I am very logically and discretely inclined.