Timothy Donald Cook is an American business executive who has been the CEO of Apple since 2011. Cook had previously been the company's COO under its co-founder Steve Jobs. Cook joined Apple in March 1998 as a senior vice president for worldwide operations, and then as vice president for worldwide sales and operations. He was appointed chief executive of Apple on August 24, 2011, after Jobs resigned.
During his tenure as the chief executive of Apple and while serving on its board of directors, he has advocated for the political reform of international and domestic surveillance, cybersecurity, national manufacturing, and environmental preservation. Since becoming CEO, Cook has also replaced Jobs' micromanagement with a more liberal style and implemented a collaborative culture at Apple.
Since 2011 when he took over Apple, to 2020, Cook doubled the company's revenue and profit, and the company's market value increased from $348 billion to $1.9 trillion. In 2025, Apple was the second largest technology company by revenue, with US$416 billion.
Outside of Apple, Cook has sat on the board of directors of Nike since 2005.