In 1985, one of us (David Maister) wrote an article for the Sloan Management Review called “The One-Firm Firm.” It identified a strategy common to leading firms across a broad array of professions — creating institutional loyalty and team focus.

The firms named in that article were McKinsey, Goldman Sachs, Arthur Andersen, Hewitt Associates, and Latham & Watkins, where Jack Walker became managing partner three years later.

If one is prepared to accept the argument that Accenture (formerly Andersen Consulting) is the legacy firm of Arthur Andersen, and not the defunct audit-based business, then that 1985 list of one-firm firms stacks up remarkably well as a predictor of subsequent success. These are still preeminent and immensely successful firms.

The marketplace for professional services has changed in ways that were unimaginable in 1985. Clients and client relationships have become dynamic at best and fickle at worst. Shortages and mobility of talent have affected every profession. As a result, the five named firms — and their main competitors — have adapted by making dramatic and often risky changes.

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