Aristotle was a Greek philosopher, a student of Plato, and teacher of Alexander the Great. His wrote on: physics, metaphysics, poetry, theater, music, logic, rhetoric, linguistics, politics, government, ethics, biology, and zoology. His thought in multiple fields was considered definitive for millennia, and his work in ethics and politics is still widely influential today. He is one of the greatest philosophers in the history of western philosophy. And yes, he believed a person should live a meaningful life.
