(; , Aristotéles
; 384–322 BC) was a Greek philosopher
and scientist born in the city of Stagira
, on the northern periphery of Classical Greece
. His father, Nicomachus
, died when Aristotle was a child, whereafter Proxenus of Atarneus
became his guardian. At eighteen, he joined Plato's Academy
in Athens and remained there until the age of thirty-seven (c.
347 BC). His writings cover many subjects – including physics
, ethics, aesthetics
, theater, music, rhetoric
, politics and government – and constitute the first comprehensive system of Western philosophy
. Shortly after Plato died, Aristotle left Athens and, at the request of Philip of Macedon
, tutored Alexander the Great
starting from 343 BC. According to the Encyclopædia Britannica
, "Aristotle was the first genuine scientist in history ... [and] every scientist is in his debt."