Multiple sources, including cross-references and web searches, report that Tim Cook is stepping down as CEO and that John Ternus will replace him in September. The details regarding the roles (Cook becoming executive chairman, Ternus taking over) are consistent across multiple independent reports.

Both the cross-reference and multiple web search results cite the progression of Apple's valuation from $350 billion to over $4 trillion under Cook's tenure, confirming the core figures and narrative.

Two separate web search results report that the iPhone was the best-selling smartphone in Q1 2025, confirming the claim that it recently retook the top spot.

The cross-reference and multiple web search results consistently detail that John Ternus has overseen engineering for core products (iPhone, iPad, Mac) and new categories (Apple Watch, AirPods, Vision Pro), supporting the claim of a decade's work.

Multiple web search results explicitly state that John Ternus played a central role in championing Apple's shift to designing its own in-house chips instead of relying on external suppliers like Intel.

The cross-reference and web search results consistently confirm that Ternus worked at Virtual Research Systems as a mechanical engineer before joining Apple in 2001 on the product design team.

Multiple sources, including cross-references and web searches, confirm the timeline of his promotions: VP in 2013 and SVP in 2021.

Two independent sources (cross-references) confirm that John Ternus holds a bachelor's degree in mechanical engineering from the University of Pennsylvania.

Multiple web search results state that John Ternus is 50 years old and that this age matches the age Tim Cook was when he succeeded Steve Jobs.

The cross-reference reports that rivals like Google, Microsoft, and OpenAI have rolled out advanced generative AI chatbots, which is supported by the general context of the web search results discussing AI advancements.