507: Jim McKelvey—A Square Peg in a Glass Hole

Jim McKelvey is an entrepreneur, innovator, computer engineer, and master glassblower who helped build a billion-dollar company. That's not the usual career path, but then, Jim McKelvey isn't your usual entrepreneur. The co-founder of Square, along with Jack Dorsey, McKelvey turned a frustrating experience in his glass studio into a business that changed the…