Apple Hires Chief Medical Officer From Pulse Oximetry Company Masimo, Possibly for iWatch Team

Over the course of the last year, Apple has made several hires from the medical and sensor field, presumably to bolster the team of experts working on its much-rumored smart watch project, and MacRumors today learned of another high-profile sensor expert that has joined the company.

Michael O'Reilly, M.D., formerly the Chief Medical Officer and EVP of Medical Affairs at Masimo Corporation, left his position in July of 2013 to take on a role at Apple, possibly on the iWatch team. News of O'Reilly's employment at Apple was first leaked to MobiHealthNews last week and when contacted for comment earlier today, Masimo told MacRumors it "could not dispute" what had been reported.

While O'Reilly was at Masimo, the company developed several cutting edge pulse oximetry devices, including the iSpO2 Pulse Oximeter that connects to the iPhone and gives readings via an accompanying app. The iSpO2, which takes its readings from a finger, is designed to measure both oxygen saturation in the blood and pulse rate, with technology that allows it to take readings during movement and with low blood flow.

ispo2pulseoximeterdevice

The iSpO2 Pulse Oximeter for iPhone

While it is not clear what position O'Reilly holds with Apple or how his pulse oximetry expertise will be used by the company, he does join a number of other hires in the medical field that have reportedly been recruited for the iWatch team. In 2013, Apple hired several scientists and executives from notable sensor companies like AccuVein, C8 MediSensors, and Senseonics, and two weeks ago, another report pointed to two additional hires in the sensor field.

Reports have suggested that Apple's smart watch project, the iWatch, could focus heavily on health sensors and biometrics, possibly including features like a pedometer and a heart rate monitor. Apple's multitude of hires in the health field does suggest, however, that the company could include even more advanced sensor technology in the iWatch or in a future product.

With the addition of O'Reilly, Apple has now hired employees with expertise in pulse oximetry, vasculature visualization (vein finding), non-invasive glucose monitoring, blood chemistry monitoring via microneedle, heart/breath rate monitoring, and fitness. Notably, several hires have also had experience with low-profile, non-invasive biosensor devices.

On his LinkedIn page, O'Reilly is also listed as both an Adjunct Associate Professor of Anesthesiology at the University of Michigan and a Professor of Anesthesiology and Perioperative Care at the University of California, Irvine.

Related Roundup: Apple Watch 11
Buyer's Guide: Apple Watch (Buy Now)

Popular Stories

Apple Wallet ID Illinois

Apple Plans to Expand iPhone Driver's Licenses to These 7 U.S. States

Wednesday December 24, 2025 8:40 am PST by
In select U.S. states, residents can add their driver's license or state ID to the Apple Wallet app on the iPhone and Apple Watch, and then use it to display proof of identity or age at select airports and businesses, and in select apps. The feature is currently available in 13 U.S. states and Puerto Rico, and it is expected to launch in at least seven more in the future. To set up the...
iPhone Top Left Hole Punch Face ID Feature Purple

iPhone 18 Pro Launching Next Year With These 12 New Features

Tuesday December 23, 2025 8:36 am PST by
While the iPhone 18 Pro and iPhone 18 Pro Max are not expected to launch for another nine months, there are already plenty of rumors about the devices. Below, we have recapped 12 features rumored for the iPhone 18 Pro models. The same overall design is expected, with 6.3-inch and 6.9-inch display sizes, and a "plateau" housing three rear cameras Under-screen Face ID Front camera in...
maxresdefault

Where's the New Apple TV?

Monday December 22, 2025 11:30 am PST by
Apple hasn't updated the Apple TV 4K since 2022, and 2025 was supposed to be the year that we got a refresh. There were rumors suggesting Apple would release the new Apple TV before the end of 2025, but it looks like that's not going to happen now. Subscribe to the MacRumors YouTube channel for more videos. Bloomberg's Mark Gurman said several times across 2024 and 2025 that Apple would...
maxresdefault

10 Mac Apps Worth Trying in 2026

Wednesday December 24, 2025 9:27 am PST by
2026 is almost upon us, and a new year is a good time to try out some new apps. We've rounded up 10 excellent Mac apps that are worth checking out. Subscribe to the MacRumors YouTube channel for more videos. Alt-Tab (Free) - Alt-Tab brings a Windows-style alt + tab thumbnail preview option to the Mac. You can see a full window preview of open apps and app windows. One Thing (Free) -...
iOS 26

iOS 26.2 Adds These 8 New Features to Your iPhone

Monday December 22, 2025 8:47 am PST by
Earlier this month, Apple released iOS 26.2, following more than a month of beta testing. It is a big update, with many new features and changes for iPhones. iOS 26.2 adds a Liquid Glass slider for the Lock Screen's clock, offline lyrics in Apple Music, and more. Below, we have highlighted a total of eight new features. Liquid Glass Slider on Lock Screen A new slider in the Lock...
airpods color prototypes

Apple Tested AirPods in Bright Colors

Saturday December 27, 2025 6:06 am PST by
Apple reportedly tested a version of the first-generation AirPods with bright, iPhone 5c-like colored charging cases. The images, shared by the Apple leaker and prototype collector known as "Kosutami," claim to show first-generation AirPods prototypes with pink and yellow exterior casings. The interior of the charging case and the earbuds themselves remain white. They seem close to some...
iPhone Fold Vertical Feature

Why Apple's Foldable iPhone May Be Smaller Than Expected

Tuesday December 23, 2025 5:21 am PST by
Apple's first foldable iPhone, rumored for release next year, may turn out to be smaller than most people imagine, if a recent report is anything to go by. According to The Information, the outer display on the book-style device will measure just 5.3 inches – that's smaller than the 5.4-inch screen on the ‌iPhone‌ mini, a line Apple discontinued in 2022 due to poor sales. The report has led ...
Foldable iPhone 2023 Feature Iridescent Search

Samsung Developing 'Wide Fold' With iPhone Fold-Like Design Ahead of Apple's 2026 Launch

Tuesday December 23, 2025 11:55 am PST by
Samsung is working on a new foldable smartphone that's wider and shorter than the models that it's released before, according to Korean news site ETNews. The "Wide Fold" will compete with Apple's iPhone Fold that's set to launch in September 2026. Samsung's existing Galaxy Z Fold7 display is 6.5 inches when closed, and 8 inches when open, with a 21:9 aspect ratio when folded and a 20:18...
iPhone SE Cosmopolitan Clean

Apple Discontinued These 25 Products This Year

Wednesday December 24, 2025 7:24 am PST by
With the end of 2025 near, the time has come to look back at the devices and accessories that Apple discontinued throughout the year. Most of the products that were discontinued this year were simply replaced by a new model with an updated chip. However, the iPhone SE line was entirely discontinued when the iPhone 16e launched, and the iPhone Plus line is being phased out. Below, we have...

Top Rated Comments

Sky Blue Avatar
155 months ago
damn! this iwatch is going to be a mobile hospital!
Score: 6 Votes (Like | Disagree)
o0smoothies0o Avatar
155 months ago
I hope people can understand the potential of this product by now.

Yeah, the sad part is that people still don't. 'Watches are useless'. Good thing Apple actually has intelligent, imaginative people working for them, as opposed to the people who can't even think past 'It tells time'.
Score: 5 Votes (Like | Disagree)
IJ Reilly Avatar
155 months ago
The only thing I don't understand is whether or not this will be stand-alone device or not.
The only thing? Nobody knows any thing.

----------

damn! this iwatch is going to be a mobile hospital!
Just wait till you see the prostate exam app!
Score: 5 Votes (Like | Disagree)
Rayd5365 Avatar
155 months ago
it seems that the watch is not nearly as close to being finished as i would have hoped. if they are still hiring people for sensors they can't possibly be finished with the design or testing of the watch. hopefully they speed things up! :apple:

Note though that the hire was supposedly made last July….
Score: 3 Votes (Like | Disagree)
IJ Reilly Avatar
155 months ago
I hope it doest require a probe :eek:

Let's put it this way: It will put the "i" in iWatch.

----------

At last, the penny has dropped for the watchers.

The iWatch may well have some form of simple monitoring, but I reckon Apple is going much further into the medical field.

Already iPads are used extensively in hospitals for displaying scan and x-ray results. Integrated medical systems could be the next big field for Apple, just as instrumentation was for Hewlett-Packard in the 1960s. Could stray into Agilent (http://en.wikipedia.org/wiki/Agilent_Technologies)'s backyard.

.

I suspect you are onto something This is why I thought Apple might make a play for the remnants of Kodak, with their medical imaging products and patents.
Score: 2 Votes (Like | Disagree)
iLondoner Avatar
155 months ago
At last, the penny has dropped for the watchers.

The iWatch may well have some form of simple monitoring, but I reckon Apple is going much further into the medical field.

Already iPads are used extensively in hospitals for displaying scan and x-ray results. Integrated medical systems could be the next big field for Apple, just as instrumentation was for Hewlett-Packard in the 1960s. Could stray into Agilent (http://en.wikipedia.org/wiki/Agilent_Technologies)'s backyard.

.
Score: 2 Votes (Like | Disagree)