Jeff Bezos has transformed Amazon from an online bookstore to the largest retailer in the world, with over 20 million products for sale. By obsessively focusing on customers and their needs above all else, as evidenced by Amazon's use of "The Empty Chair" concept, Bezos has created unprecedented growth and stock performance at Amazon. Through constant experimentation and a culture driven by metrics and data, Amazon strives to anticipate customer wants before purchases are made and improve the customer experience through features like expanded delivery windows.