Abstract
A serious attempt to integrate ethics in management was done by Professor Juan Antonio Pérez López (1934–1996). His thought represents a break with current scholarly thinking on these subjects. The purpose of this article is to explain some of the most significant aspects of his theories, relating basically to his recourse to ethics as what defines the characteristic behavior of human beings, considered as individuals and as members of organizations. Pérez López used the anthropological conception underlying the ethics of Aristotle and Thomas Aquinas to build a solid base for that ethics, starting from the decision-making process. He then used that ethical base to point to the kind of action theory and organization theory that could most effectively assist the human development of people and organizations