In its first issue of the new millennium, the Economist in January 2000 paid a high compliment to Harvard Business Review, calling it “a publication which almost single-handedly defines the agenda for management debate.” That description would surely have surprised the Harvard Business School dean who launched the Review precisely 90 years ago. Wallace B. Donham never envisioned that his journal, with its initial print run of 6,000 copies, would go very far beyond equipping managers-in-training with better tools of the trade. But the Economist’s words rightly describe a magazine that, all these decades later, has earned the authority not only to teach business leaders how to do things right but also to define the right things to do.

A version of this article appeared in the November 2012 issue of Harvard Business Review.