John Rawls was an American philosopher who spent his career developing theories of justice and political philosophy. His major works included A Theory of Justice (1971), which put forth his theory of a just society that prioritizes liberty and ensures inequalities benefit the least advantaged. This theory includes the "veil of ignorance" thought experiment and two principles of justice: equal basic rights and liberties, and social and economic inequalities must be to the greatest benefit of the least advantaged. Rawls argued his principles establish a fair distribution of goods and structure society to benefit all citizens.