Tony Hsieh is an entrepreneur, investor, and author best known as the CEO of Zappos, an online shoe and clothing company. He is a self-described "serial entrepreneur" and has founded or co-founded several other companies, including LinkExchange, Venture Frogs, and DTP. He is also an investor in startups such as Twitter, Uber, and Alibaba. His books, "Delivering Happiness" and "The Fortune Cookie Principle" focus on customer service and company culture.