Aristotle

Aristotle (384–322 B.C.) was a greek philosopher, founder of the sciences of logic, physics, and biology, whose writings were a major conceptual resource for medieval scholastic theologians, especially Aquinas. He studied under Plato, and in turn educated Alexander the Great. Aristotle diverged from Plato by becoming an empiricist, and he created the first comprehensive philosophical system in the West, which continues to exert influence on Western thought.