What does advice from the world’s most notorious consulting firm look like? Ian MacDougall discusses the McKinsey mystique, its work culture, the inner workings of its project to reduce violence at New York’s Rikers Island jail complex, and how the firm has shaped American capitalism over nine decades. You can read MacDougall’s annotation of one of McKinsey’s PowerPoint slides, created for the Rikers Island project—along with the entire presentation—here.