Managers Who Scaled Startups - Preventing Organizational Drift

I’m working on a story exploring this question: why do organizations lose their way as they grow and how can they stay nimble as they become market leaders? I’m looking to speak with real-world managers who have grappled with organizational drift, bureaucracy, and the challenge of scaling without losing the agility that made the company successful in the first place. If you know someone with firsthand experience who’d be willing to chat, please drop me a note. Thanks.