Apple CEO Tim Cook's legacy will likely be measured in the form of his tenure as CEO, where he expanded Apple's products into new categories like wearables and headphones, led the company to a $4 trillion valuation and a strong customer base in China. From the start of Cook's tenure, he focused on the iPhone as a new center of the company's unified device ecosystem. He also pioneered the white-plastic era of lamp iMacs, MacBooks, iPods, and iPhones, with the introduction of the Watch and iMac. The company's products have since become status symbols, with Apple's iPhone X introducing a new era of home-buttonless, all-screen-front handset design and higher prices. Despite efforts by Apple to bridge the gap between iPhone buyers and Android users, the company still enjoys social superiority in many markets. The CEO's tenure also saw Apple's embrace of celebrities as ambassadors for its products and its growing influence on celebrity appearances.