Second in Command · 2026-06-25 · 46 min
How do you actually scale without losing yourself or your team in the chaos? In this conversation, Sivana Brewer sits down with Mara Castro , COO at Twentyeight Health and former Warby Parker trailblazer, to dissect what it takes to build, lead, and sustain high-performing teams in brutally demanding, mission-driven environments. Expect raw takes on leadership, the dangerous myth of “just do more,” and what it really means to earn trust as a COO. If you’ve ever wondered why some leaders quietly burn out while others keep their team charging ahead, you cannot afford to miss this episode. Hear exclusive, battle-tested insights you won’t find in any COO playbook. Don’t settle for “what everyone does” and listen now before these lessons become your competitors’ next unfair advantage. Sponsored by Genius Network - An exclusive community for highly successful entrepreneurs, connecting you with top-tier leaders, strategic insights, and powerful relationships to help you grow your business faster and smarter.
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