This collection of essays by leading Aristotle scholars worldwide covers a wide range of topics on Aristotle's work from metaphysics, politics, ethics, bioethics, rhetoric, dialectic, aesthetics, history to physics, psychology, biology, medicine, technology. The thorough exploration of the issues investigated deepens our knowledge of the most fundamental concepts, which are crucial for an overall understanding of Aristotle's work. Moreover, the contributors explore the relevance of Aristotle's ideas to contemporary issues and provide new perspectives on the study of Aristotle's thought. The essays of the volume were presented at the plenary sessions of the World Congress "Aristotle 2400 Years," organized by the Interdisciplinary Centre for Aristotle Studies of Aristotle University of Thessaloniki, on May 23-28 2016, in commemoration of the 2400th anniversary of Aristotle's birth. The aim of the congress was to advance scholarship on all aspects of Aristotle's work, both in philosophy and in the fundamental disciplines of science. The impressive number of 250 papers from 40 countries highlighted the fact that Aristotle's work continues to exercise an influence on our intellectual lives on a global scale.