Aristotle was an ancient Greek philosopher and scientist who lived from 384 to 322 BCE. He was a student of Plato and later became the tutor of Alexander the Great. Aristotle made significant contributions to many fields, including philosophy, ethics, logic, politics, biology, and physics. He is known for his works on metaphysics, ethics, and politics, and his ideas have had a profound influence on Western thought. Aristotle's emphasis on empirical observation and logical reasoning laid the foundation for the scientific method and his writings continue to be studied and debated to this day.