Procter & Gamble — the consumer packaged goods conglomerate behind Tide, Pampers, Gillette, Pringles, and dozens of other household brands. Famous as the training ground for generations of brand marketers and the institutional home of the "brand manager" role. Relevant as the formative environment for operators like Brian Niccol (who ran Pringles before Taco Bell, Chipotle, and Starbucks).