Tim Cook, the CEO of Apple, has announced that he is stepping aside from his position as CEO and will become Apple's executive chairman in September. He will be replaced by John Ternus, a brilliant engineer and thinker who has spent 25 years building the Apple products our users love. Cook expresses gratitude for the company's shared humanity and a deepening obligation to work harder and push further within the company. He also expresses pride in his successor's commitment to the position.