John Bordley Rawls (; February 21, 1921 – November 24, 2002) was an American moral, legal and political philosopher in the modern liberal tradition. Rawls has been described as one of the most influential political philosophers of the 20th century. In 1990, Will Kymlicka wrote in his introduction to the field that "it is generally accepted that the recent rebirth of normative political philosophy began with the publication of John Rawls's A Theory of Justice in 1971".
https://en.wikipedia.org/wiki/John_Rawls