Abstract: Professor David Kennedy’s 2018 Montesquieu Lecture considers the role of expert legal knowledge in our political and economic life. As politicians, citizens, and experts engage one another on a technocratic terrain of irresolvable argument and uncertain knowledge, a world of astonishing inequality and injustice is born. Kennedy draws on his experience working with international lawyers, human rights advocates, policy professionals, economic development specialists, military lawyers, and humanitarian strategists to describe the conflicts, unexamined assumptions, and assertions of power and entitlement that lie at the center of expert rule. He explores how we can harness expert knowledge to remake an unjust world.