The timeless value of ethics and social philosophy of the ancient Greeks, with Aristotle as their "foremost" representative, is evident in the realm of leadership, particularly in the definition, theories of leadership, leadership models, standards, and styles. Aristotle's ethical philosophy in the "Nicomachean Ethics" in conjunction with his comprehensive manual on Rhetoric, both products of the great philosopher's pen, shape the model of "virtuous" ethics and the leader's communicative interaction. The four ancient Greek virtues of wisdom, prudence, justice, and courage, along with their derivatives, constitute the essential tools of communication strategy, motivation, and decision-making for the leader. This study was written during the crisis of the Covid-19 pandemic in Greece, as well as throughout Europe. Therefore, it aspires to be a comprehensive manual on the role and personality of the excellent leader, their self-awareness and emotional intelligence as assets for empowering and encouraging their own and their employees' in Organizations and Businesses after the economic, social, ethical, and psychological chaos caused and continued by the pandemic. Leaders are tested in times of crisis and in constantly changing environments. The modern form of a pandemic has become an occasion to once again emphasize the dynamic concept of influence, impact, and persuasion that a leader can exert. Their actions and thoughts are judged within the framework of Aristotelian ethical realism. The leader has only two aspects to display: the creative aspect, where within the crisis they find the opportunity to envision, recreate, organize, inspire, and coordinate, transforming chaos into opportunity, into possibility. The other aspect is self-destructive, in which through their behavior resembling the dark side of a Machiavellian egotist and arrogant leader, they become the cause of their own self-isolation, creating their own psychological chaos!