Hardy Grewal may not be as internationally known as Steve Jobs, Bill Gates and Howard Schultz, but his business is as much of a household name as Apple, Microsoft and Starbucks. Grewal went from corporate accountant to business mogul in one simple step: buying a Subway franchise. That giant leap plugged Grewal into the power of a big franchise, yes, but, more importantly, into the bigger powerhouse that is franchising itself.