John Ternus' most important move in recent years was leading the Mac transition from x86 (Intel) to ARM (Apple's own Apple Silicon). Pulling off a full-stack shift across hardware, software, and the developer ecosystem in one go, and turning that into a commercial success, required a very high level of execution and tight cross-functional coordination. Without this, there wouldn't be the success of today's MacBook Neo and the advantage Apple now holds as it gears up for AI devices.
The iPhone has been the core driver of Apple's hardware business for nearly two decades, yet the new CEO does not come out of the iPhone side of the business. That suggests the board is applying a broader set of criteria, not just picking the leader with the most visible wins.
Moving the Mac to Apple Silicon was a system- and platform-level transition, essentially a brain transplant. Within Apple, no one has more experience managing a shift at this scale than John Ternus. That is exactly what Apple needs as it moves into the next phase of on-device AI.
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Tim Cook remains one of the few tech leaders able to maintain working relationships with both the U.S. and Chinese governments. Apple will likely still need to rely on him on the geopolitical front in the foreseeable future.
If John Ternus visits Asia, two things to watch: first, the details of his meetings with the Chinese government; second, which Asian suppliers he meets with.
Apple's largest assembly partner, Foxconn, announced on April 1 that Michael Chiang, who leads its iPhone business, will take on the rotating CEO role. At this point, with AI dominating the industry narrative, this move is unlikely to be coincidental. It should help maintain, and potentially strengthen, the relationship with Apple during the CEO transition.