Aristotle

Aristotle is the great philosophers of all time. Using his gut, he discovered the existence of logic, and formulated a number of empirical axioms which he called "syllogisms", the most famous undoubtedly being
 * If all A are B
 * and all B are C
 * then all A are C.

As for the other syllogisms, nobody remembers them, but everyone knows that, together with the above syllogism, one can prove conclusively that God exists, and that capitalism rocks.