Ron Shaich is a business visionary who has been part of building three iconic restaurant brands: Au Bon Pain, Panera Bread, and now Cava. Along the way, he developed "fast casual," a $100 billion-plus segment of the industry. Now he reveals what he learned about entrepreneurship, running large enterprises, business transformation, and life itself. He illustrates these lessons with his experiences turning a small cookie store into 2,400 restaurants with $5 billion in revenue, delivering annual investor returns of 25% over two decades, and outperforming both Starbucks and Chipotle. How did Shaich succeed repeatedly in such a tough industry? By discovering today what will matter tomorrow and never hesitating to undertake sweeping transformations to get the job done. Telling yourself the truth, knowing what really matters, and getting it done is the path to creating and sustaining a meaningful life, a market-leading business, and even a healthier society. Shaich's reflections are sometimes practical ("Make smart bets"), sometimes philosophical ("Conduct an annual pre-mortem"), often challenging ("You don't own the business, the business owns you"), and always incisive ("You take the money, I'll take control."). Know What Matters is a powerful guide to building transformative businesses while leading a life you respect and leaving a positive impact on the world.