Aristoteles (384 - 322 BC) was an ancient Greek philosopher. Along with his teacher Plato is an important form of philosophical thought in the ancient world, and teachings deeply penetrated the western philosophical and scientific thought until the Scientific Revolution of the 17th century. He was a naturalist, philosopher, creator of the logical thought and the most important of the ancient dialects.
Teacher of Alexander the Great for six years, came ater in Athens, where had created his own philosophic school. To install the school chose the Gymnasium also named Lyceum, found recently in Athens behind the Byzantine Museum of Athens. With money they gave him plenty Alexander, Aristotle built magnificent houses and galleries, called "walking" Perhaps that is why the school was called Peripatetic and his disciples ambulatory philosophers.
Aristotle wrote about 400 books total. Diogenes Laertius estimated the work to the lyrics and found that reached the 44 myriads, ie 440,000. Much of his work was lost. Belonged to the category of public or "external" classes and was written in interactive form. Of these only survived the "Athenian" in a papyrus found in Egypt. The surviving works reflect the teaching that Aristotle did for advanced students and called "hearings or internal". That is why it is written in discourse and not in dialogue. Several of his books have undergone surgeries and treatments and general condition is not good. From the huge task of him finally rescued 47 books and a few quotes from others. But not all are genuine.
In Aristoteles and Plato teaching is based the the modern way of thinking of western civilization and the corresponding philosophy.
(Translation and summary from Wikipedia with some add-ons by C. Theodorou)