from supply chain master to the engineer who has to rewire it

• Apple’s CEO transition marks the company’s first leadership change in 15 years
• John Ternus spent 25 years shaping Apple’s hardware from the inside. Now he’ll lead a company betting on India and Vietnam to redefine how it builds

When Steve Jobs handed the CEO role to Tim Cook in August 2011, the consensus in Silicon Valley was polite scepticism. Cook was a skilled behind-the-scenes operator whose mastery of supply chains had helped Apple thrive during the Jobs era, but questions immediately arose about whether he had the vision to carry Apple’s innovation mantle forward.

Within months of taking over, Apple’s stock price nearly doubled. He answered his critics the only way that matters. Fifteen years on, Apple is doing this again. On Monday, the company confirmed that Cook, now 65, will step down as CEO on September 1, moving to executive chairman.

John Ternus, SVP of Hardware Engineering and a 25-year Apple veteran, will take the top job. And once again, the same questions are already forming: is this the right person, and is the timing right?

The difference this time is that the uncertainty isn’t about vision. It’s about whether Apple can hold together one of the most complex manufacturing operations in the world while simultaneously reinventing where and how it builds things.

From the supply chain to the product line

Cook’s defining contribution to Apple wasn’t the iPhone. It was making sure hundreds of millions of iPhones could actually be made, on time, at scale, every year. Under Cook, the iPhone grew into a US$210 billion per year business generating nearly half of Apple’s total revenue. That engine runs on a supply chain that, for all its efficiency, remains heavily concentrated in one part of the world.

China still accounts for around 80% of Apple’s production capacity, with roughly 90% of iPhones assembled there. That worked well for decades. It works less well now, with US tariffs reshaping trade flows and geopolitical pressure mounting on companies with deep China exposure. But Apple has been moving–fast.

As far back as May 2025, during Apple’s Q2 earnings call, Cook told analysts that the majority of iPhones sold in the US would have India as their country of origin for the June quarter, with Vietnam the country of origin for almost all iPads, Mac, Apple Watches, and AirPods sold in the US. The decision is a direct response to US tariff pressure that was already reshaping the company’s production calculus. That shift has continued since, and it is now the reality Ternus inherits.

The challenge is real: India and Southeast Asia have made inroads in electronics assembly, but precision manufacturing and printed circuit boards remain largely concentrated in China. Closing that gap is not a logistics problem. It is a hardware problem.

The engineer in the corner office

This is precisely where Ternus’s background becomes the argument for him. He joined Apple’s product design team in 2001, rose to VP of Hardware Engineering by 2013, and has been involved in nearly everything Apple has shipped over the past decade–AirPods, Apple Watch, the Apple Silicon transition, and most recently the MacBook Neo.

He also has a clear philosophy about craft. Ternus has recounted a story about Jobs inspecting the back of a chest of drawers and being bothered by the unfinished wood, a surface no customer would ever see. Ternus has said he thinks about that story constantly, as it captures what Apple is supposed to do.

Rethinking manufacturing in India and Vietnam, building quality into factories that didn’t exist in their current form five years ago, is very much a question of what happens where no one is watching.

The leadership structure around him has also been reorganised. Johny Srouji, previously SVP of Hardware Technologies, has been named chief hardware officer effective immediately, taking over the hardware engineering organisation and expanding his role to cover silicon strategy, product design, and reliability.

Cook called him one of the most talented people he has worked with and said his influence on Apple’s silicon strategy has been felt across the industry. Ternus and Srouji are, in other words, the hardware leadership pairing Apple is placing its next chapter on.

Cook will remain close. His executive chairman role includes engaging with policymakers globally, which, given Apple’s tariff exposure across Asia, matters. It’s a cleaner handover than 2011 was, without the grief and without the existential doubt. But the pressures Ternus walks into are no less real.