Aristotle 

One of the fathers of philosophy, the GreekAristotle made a significant and lasting impact to every aspect of human knowledge, from logic and biology to ethics and the arts. While he might have been overshadowed by his famous teacher Plato, his enlightened works stand as brilliant writings that changed the subject forever.

His past and present likeness convey a man who spent most of his time deep in thought. As someone with brilliant utterances that he shared with anyone, this almost other-worldly genius likely would have a huge following today.