Walzer is a political theorist and professor at the Institute for Advanced Study in Princeton, New Jersey. He is best known for his work on the theory of distributive justice and the concept of complex equality.
His most famous book is Spheres of Justice: A Defense of Pluralism and Equality (1983), where Walzer argues that different spheres of social life, such as the economy, the family, and politics, should each be governed by distinct principles of justice.
Walzer has also written extensively on a wide range of topics in political theory, including war and peace, nationalism, and political obligation.