Health is Tim Cook's defining legacy - and your Apple Watch proves it

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ZDNET's key takeaways

• The Apple Watch is one of Tim Cook's biggest successes.
• The device dramatically changed the wearables market.
• During Cook's tenure, Apple boosted its health offerings and research.

When Tim Cook unveiled the first Apple Watch in 2014, he called it the most personal product Apple had developed. He might not have predicted that the smartwatch could detect hypertension, catch atrial fibrillation, or save lives a decade later.

A few years into the Apple Watch's existence, though, Cook's vision for the device, Apple's health agenda, and its connected ecosystem was fully formed. His tenure is marked by a legacy that leaves no aspect of present-day health technology untouched.

Apple's CEO of nearly 15 years will step down in September, closing a chapter of ...