Aristoteles, also known as 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 various fields, including philosophy, biology, ethics, and politics, and is often regarded as one of the most influential thinkers in Western history. Aristotle's works laid the foundation for many disciplines, including logic, metaphysics, and natural sciences. He emphasized empirical observation and systematic classification, which influenced later scholars and the development of the scientific method. His ideas continue to be studied and debated in modern philosophy and science.