Apple After Tim Cook Timeline 2026: John Ternus, iPhone 18 & the Foldable iPhone Era

Apple’s biggest change this September may happen eight days before a single new iPhone reaches the stage. On September 1, 2026, John Ternus — a hardware engineer who joined Apple in 2001 — will become the company’s chief executive, ending Tim Cook’s 15-year run as CEO. Cook is not leaving Apple; he becomes executive chairman. Eight days later, on September 9, Apple held its first product event of the Ternus era — and confirmed the folding iPhone everyone had been talking about. It is called the iPhone Duo, and it goes on sale October 23.

At the September 9 event, Apple confirmed its first foldable iPhone, named the iPhone Duo, alongside the iPhone 18 Pro and Pro Max, AirPods 5, Apple Watch Series 12 and Apple Watch Ultra 4. The Duo opens book-style from a 5.4-inch outer display into a 7.6-inch nano-texture inner display, uses Touch ID instead of Face ID, and runs the new A20 Pro chip with vapor-chamber cooling. Pricing starts at $1,999 for 256GB and runs to $3,199 for 2TB, in Night Sky and Star White finishes. Pre-orders open October 16, with sales starting October 23 in more than 70 countries. Apple did not announce a standard iPhone 18 at this event, consistent with prior reporting that it is being held back to spring 2027. Apple also confirmed iOS 27 arrives September 14, 2026.

Apple’s board of directors unanimously approved a succession plan under which Tim Cook steps down as chief executive to become executive chairman, while John Ternus, senior vice president of Hardware Engineering, becomes Apple’s next CEO, effective September 1, 2026. Cook became CEO in August 2011, succeeding Steve Jobs; his departure from the role after roughly 15 years is Apple’s first CEO change since then. Ternus joins Apple’s board of directors on the same date. Arthur Levinson, who has chaired Apple’s board for 15 years, becomes lead independent director. Johny Srouji, previously SVP of Hardware Technologies, becomes chief hardware officer, taking over Ternus’s former hardware-engineering responsibilities.

Apple has described this as long-term succession planning, not a sudden departure, a boardroom dispute, or a resignation under pressure. Tim Cook is not leaving Apple. As executive chairman, he continues to assist the company in select areas, including engagement with policymakers around the world.

Apple has not said Ternus will run the company differently than Cook did, and this article does not speculate about that. What is documented is background: Cook built his Apple career in operations and supply-chain management; Ternus built his in product design and hardware engineering, working on the iPhone, iPad, Mac, Apple Watch, AirPods and Vision Pro over roughly 25 years at the company. That is why a hardware engineer taking over is being watched closely ahead of a product event where Apple is expected to test a new iPhone form factor — not because Ternus has said hardware will define his tenure.

Apple’s own framing of the appointment, from Tim Cook: Ternus has “the mind of an engineer, the soul of an innovator, and the heart to lead with integrity,” and is, in Cook’s words, the right person to lead Apple into the future. Ternus, in turn, said he is grateful for the opportunity to carry Apple’s mission forward and committed to leading with the values that have defined the company. This article does not extend those statements into predictions about strategy Apple hasn’t announced.

This is what Ternus inherits: scale. Not one spectacular product, but more devices, more countries, more services revenue, more custom silicon, spread across a company built by 15 years of steady expansion. This article keeps Cook’s biography to that inheritance — the intent here is Apple after Tim Cook, not a full account of his career.

At the keynote, Apple confirmed the iPhone Duo, iPhone 18 Pro and Pro Max, AirPods 5, Apple Watch Series 12 and Apple Watch Ultra 4. Before the event, Apple’s invitation had confirmed only the date, time, venue and tagline — reporters had read the invite’s bright-flare graphic and blue coloring as hints toward camera or color changes, which turned out to be interpretation rather than an Apple statement.

John Ternus opened and led his first keynote as CEO, framing the iPhone as, in his words, the best personal device for AI given its existing privacy protections.

Apple confirmed its first foldable smartphone, the iPhone Duo, at the September 9 event — a category Apple had never shipped, though competitors had sold folding phones for several years. It opens book-style from a 5.4-inch outer display into a 7.6-inch nano-texture inner display, uses Touch ID instead of Face ID, and runs Apple’s A20 Pro chip with vapor-chamber cooling and a dual-battery system across both halves of the phone.

The iPhone Duo’s significance is less “Apple invents foldables” and more Apple bringing its hardware, software, custom silicon and developer ecosystem into a category that already existed. It is a new category for Apple, not a new category for the smartphone industry.

These are Apple’s own keynote announcements, not pre-event reporting. Pre-event rumors about a smaller Dynamic Island cutout, updated modem/connectivity hardware and a light-blue color option were not independently confirmed in this update and are left off this list until verified.

Apple’s September 9 lineup was the iPhone 18 Pro, iPhone 18 Pro Max and iPhone Duo — no standard iPhone 18 was announced. This matches prior reporting, including supply-chain accounts pointing to assembly partner Pegatron, that Apple would split its iPhone 18 lineup: premium Pro and Pro Max models plus the Duo in fall 2026, with the more affordable standard iPhone 18, a new iPhone 18e, and a second-generation iPhone Air reported for spring 2027. Reported drivers include tight memory-chip and custom-silicon supply being directed toward higher-margin Pro models first, and a desire to compete with Chinese phone makers who typically launch flagships earlier in the calendar year.

Wording matters here. Apple never announced a September 2026 release date for the standard iPhone 18, so describing it as officially delayed is misleading — you cannot delay a date that was never announced. The accurate framing: reports suggest the standard iPhone 18 will launch in 2027 rather than alongside the Pro models and Duo this September, reflecting a reportedly changed release cadence, not a confirmed schedule slip.

Apple officially previewed all six operating systems at WWDC26, alongside the next generation of Apple Intelligence and a rebuilt Siri AI — a new assistant architecture combining personal context, on-screen awareness, app actions, web information, on-device intelligence and Private Cloud Compute. Siri AI is expected to reach beta later in 2026, in English first, and Apple has said it will not be available on iPhone or iPad in the European Union at iOS 27/iPadOS 27 launch, citing requirements under the EU’s Digital Markets Act. At the September 9 keynote, Apple confirmed iOS 27 and iPadOS 27 ship September 14, 2026; the other four platforms remain dated only to “this fall.”

A folding phone would make a dramatic first keynote image. The harder parts of Ternus’s job play out over years, not one September morning: can Siri become genuinely competitive, can Apple keep growing outside China without losing its manufacturing advantage, can services keep growing under regulatory pressure, and can hardware still create the kind of upgrade cycle that made the iPhone central to Apple’s business. Those questions will define the new CEO far more than a single keynote.

Ternus has not been CEO for even one day as of this update. Declaring his “era” already defined by foldables, or anything else, gets ahead of the facts. The story is only beginning.