Anaxagoras (Greek: Ἀναξαγόρας, fl. 480 BC – 450 BC) was a Pre-Socratic Greek philosopher. Anaxagoras was an Ionian Greek. He was born in Asia Minor, in Clazomenae. This was a town in what is now Turkey.
Anaxagoras was the first known atheist. He also introduced the concept of νούσ (nous, or mind), the ordering force behind the Universe. But he did not take this idea any further.