John Ternus Takes Helm as Apple CEO, Ending Tim Cook's 15-Year Tenure

John Ternus officially became Apple's new chief executive on September 1, 2026, succeeding Tim Cook after nearly 15 years. Cook, who steered Apple through the Apple Watch, AirPods, and a $4 trillion market cap, transitions to executive chairman. Ternus, a hardware engineering veteran who helped launch the iPhone 6 and Apple Silicon Macs, now faces an AI-first mandate — Apple has made clear that artificial intelligence is job number one under the new regime.

Key Takeaways

John Ternus officially became Apple's new chief executive on September 1, 2026, succeeding Tim Cook after nearly 15 years.
Cook, who steered Apple through the Apple Watch, AirPods, and a $4 trillion market cap, transitions to executive chairman.
Ternus, a hardware engineering veteran who helped launch the iPhone 6 and Apple Silicon Macs, now faces an AI-first mandate — Apple has made clear that artificial intelligence is job number one under the new regime.

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John Ternus became Apple's chief executive on September 1, 2026, marking the end of Tim Cook's nearly 15-year run as the company's leader — the longest-serving CEO in Apple's modern history.

The transition was announced in April, but Monday was the day Ternus officially took the reins. Cook, who guided Apple through the launch of the Apple Watch, AirPods, and the company's ascent to a $4 trillion market capitalization, moves to executive chairman of the board. Johny Srouji, Apple's longtime silicon chief, steps into the role vacated by Ternus as senior vice president of hardware engineering.

Ternus, who joined Apple in 2001, spent most of his career leading hardware engineering efforts. He was a key figure in the development of the iPhone 6 generation and oversaw Apple's transition to its own M-series chips — a shift that redefined the company's Mac and iPad lines. His deep engineering background distinguishes him from Cook, who came from Apple's operations and supply chain side.

Apple has made clear that the new CEO's top priority is artificial intelligence. The company told investors and analysts that Ternus's mandate is to position Apple at the forefront of the AI era, after the firm faced criticism for falling behind rivals like Google and Samsung in generative AI features. Apple Intelligence, the company's on-device and cloud AI platform, will be central to Ternus's strategy.

Cook's departure caps a tenure that ranks among the most consequential in Silicon Valley history. Under his leadership, Apple's revenue grew from $100 billion to over $380 billion annually, the company became the first to breach $1 trillion, $2 trillion, $3 trillion, and eventually $4 trillion in market value, and it expanded into services, wearables, and subscriptions as major business lines.

Analysts see Ternus as a continuity pick who will maintain Apple's focus on hardware-software integration while pushing more aggressively into AI services. His first major product cycle — expected to include the iPhone 17 lineup and potential updates to Apple's wearable and computing lines — will be closely watched as the first test of his leadership.