It’s the end of an era in Cupertino. After more than 25 years of shaping the look, feel, and sheer existence of Apple’s most iconic products, executive Jeff Williams has officially retired. His profile was quietly removed from Apple’s leadership webpage on Friday, which, according to Bloomberg‘s Mark Gurman, marked his final day with the company.

While the move was telegraphed—Apple announced his retirement plans back in July—the finality of his departure sends a significant ripple through the tech giant. Williams wasn’t just another suit; he was a core part of the company’s operational soul and, for a long time, considered a top contender to one day take over the CEO job from Tim Cook.

His departure is a big deal, and to understand why, you have to look at the massive, overlapping roles he played.

Jeff Williams joined Apple in 1998, a time when the company was still clawing its way back from the brink of bankruptcy. Recruited from IBM by Tim Cook himself, Williams came in as a ‘head of worldwide procurement’ and quickly became indispensable.

For the past decade, as Chief Operations Officer (COO) since 2015, Williams was the master of Apple’s sprawling, mind-bogglingly complex global supply chain. If you’ve ever wondered how Apple manages to manufacture and ship hundreds of millions of iPhones, Macs, and iPads across the globe with clockwork precision, the answer, in large part, was Jeff Williams.

He was, in many ways, “Tim Cook’s Tim Cook.” Like his boss, Williams shared a background in operations (and even a Duke MBA) and possessed a quiet, detail-obsessed demeanor that valued brutal efficiency over flashy headlines. While Steve Jobs and later Jony Ive were the visionaries on stage, Williams was the one backstage making sure the vision could actually be built, scaled, and put in your pocket.

He managed the entire worldwide operations, customer service, and support—the unglamorous, essential work that turned Apple from a boutique computer company into the most valuable corporation on Earth.

Father of the Apple Watch

But Williams was never just “the operations guy.” He broke the mold by leading the engineering and development of the Apple Watch.

While Jony Ive’s design team famously obsessed over the device’s aesthetics, it was Williams who championed its function, particularly its evolution into a serious health-tracking device. He oversaw the teams that developed the heart rate sensors, the ECG app, and the blood oxygen monitors—features that have genuinely saved lives and transformed the Watch from a tech accessory into a wellness powerhouse.

His passion for the company’s health initiatives was reportedly personal and deep, and he’s credited with architecting Apple’s entire strategy in the space.

Then, in 2023, he took on perhaps his most unexpected role. Following the departure of Jony Ive and his successor, Evans Hankey, Apple’s legendary design team—the creative heart of the company—was left without a clear design-focused leader. In a move that surprised many, Williams, the operations guru, stepped in to lead the studio. It was a testament to the immense trust and respect he commanded within Apple, bridging the gap between the hard-headed worlds of engineering and the free-flowing creativity of design.

A “privilege of a lifetime”

The transition has been smooth and, in typical Apple fashion, long-planned. Williams actually stepped down from the COO role in July, handing the operational reins to Sabih Khan, another 27-year Apple veteran who Williams himself called “the most talented operations executive on the planet.“

For the past few months, Williams stayed on as a Senior Vice President, focusing on wrapping up his work with the design, Watch, and health teams.

In his statement from July, Williams summed up his feelings perfectly:

I have a deep love for Apple. Working with all of the amazing people at this company has been a privilege of a lifetime, and I can’t thank Tim enough for the opportunity, his inspirational leadership, and our friendship over the years. June marked my 27th anniversary with Apple, and my 40th in the industry. Beginning next year, I plan to spend more time with friends and family, including five grandchildren and counting.

Tim Cook was equally effusive in his praise, highlighting Williams’ vast, cross-functional impact:

Jeff and I have worked alongside each other for as long as I can remember, and Apple wouldn’t be what it is without him. He’s helped to create one of the most respected global supply chains in the world; launched Apple Watch and overseen its development; architected Apple’s health strategy; and led our world class team of designers with great wisdom, heart, and dedication.

With Williams’ exit, the “who’s next after Tim Cook” question gets a major shake-up. For years, Williams was the logical choice. Now, all eyes are turning to a new generation of leaders, like hardware chief John Ternus.

It’s a quiet goodbye for an executive who, despite his immense power, was never the loudest voice in the room. But for the man who helped build the iPhone, launched the Apple Watch, and kept the entire Apple empire running on time, “legacy” feels like an understatement.