A 25-year insider inherits the AI catch-up problem and a launch event next week.

John Ternus once spent a night past midnight in a supplier factory, counting grooves on a screw head with a magnifying glass. There were 35. There should have been 25. Twenty-five years later, that same engineer runs Apple. Tim Cook handed him the CEO job on Tuesday, and Ternus takes over days before an iPhone event.

Ternus is 51 and has been at Apple for 25 years, joining the product design team in 2001. It was his second job out of college; the first was at a small VR hardware maker called Virtual Research Systems. He made VP of hardware engineering by 2013 and SVP in 2021. Until Apple named him successor in April, most people outside the enthusiast press had never heard of him. He is 15 years younger than Cook. Apple has had two CEOs this millennium. The age gap reads like a deliberate bet on another long run. Ternus swam at Penn and built a head-controlled feeding arm for people with quadriplegia as his senior project. Public donation records show $2,900 to Senator Chuck Schumer in 2021.

His fingerprints are on most of the hardware Apple sells:

• AirPods and Watch: he ran hardware development for both product lines.
• Vision Pro: the headset shipped under his engineering org.
• Apple silicon: he helped move Macs off Intel chips.
• MacBook Neo: the cheaper laptop that runs on an iPhone chip.

On the Neo, Ternus told Tom’s Guide that Apple refused to ship junk and had to build something new from the ground up to hit the price. Asked recently about Steve Jobs, Ternus reached for a story about a chest of drawers finished as carefully on the back as the front. Nobody sees the back. That is the point. Cook used his last note to staff to call Ternus brilliant and capable, and said he was leaving with confidence. He stays on as executive chairman.

Next week’s iPhone event. A rebuilt Siri running on Google’s Gemini. An AI race Apple is behind in. And an open question about what the technology inside Vision Pro becomes next.

The screw-counter now sets the roadmap, and the open question is whether that instinct travels to software.

If you sell into or build on Apple, the practical question is whether hardware discipline now outranks AI ambition. Ternus is a supply-chain-and-silicon operator, not a services executive. Expect device margins, chip roadmaps, and price tiers like the Neo to move first, and expect Siri to lean on Google’s model rather than an Apple-built one. Plan your integration bets accordingly.