Philosophical anarchism has met the criticism of members of academia following the release of pro-anarchist books such as A. John Simmons' "Moral Principles and Political Obligations". Law professor William A. Edmundson authored an essay arguing against three major philosophical anarchist principles which he finds fallacious. Edmundson claims that while the individual does not owe the state a duty of obedience, this does not imply that anarchism is the inevitable conclusion and the state is still morally legitimate. In "The Problem of Political Authority", Michael Huemer defends philosophical anarchism, claiming that "political authority is a moral illusion."