The core of Johnston's humanist liberalism is the claim that the purpose of political and social arrangements should be to empower individuals to be effective agents.
David Johnston teaches political philosophy at Columbia University, where he has served as Nell and Herbert M. Singer Professor of Contemporary Civilization and Joseph Straus Professor of Political Philosophy. He is the author of A Brief History of Justice, The Idea of a Liberal Theory, and The Rhetoric of Leviathan: Thomas Hobbes and the Politics of Cultural Transformation, and is the editor of a collection of readings entitled Equality and coeditor of Machiavelli on Liberty and Conflict.