The author of A Theory of Justice is john rawls. John rawls is an American political philosopher, ethicist, Ph.D. at Princeton University and a professor at Harvard University. He is the author of famous works such as A Theory of Justice, Political Liberalism, Justice as Fairness: A New Theory of Justice and the Law of Peoples. He is one of the most famous political philosophers in the English-speaking world in the 20th century.

John rawls is one of the main representatives of the Western New Natural Law School in 1970s, and also one of the greatest philosophers in the 20th century.

A brief introduction to other situations of a theory of justice.

The book A Theory of Justice consists of 3 chapters and 9 sections. 1 Chapter talks about "theory" and discusses the definition, historical development, function, connotation and original state of justice. The second part is "system", which analyzes social and political system, economic system and civil life with the principle of justice. The third chapter is "purpose", which discusses some topics in the field of ethics, including kindness, self-esteem, virtue, self-discipline, sense of justice, sense of morality and so on.