Our Founders

David Stavens, PhD

Chief Executive Officer

David Stavens is an entrepreneur, an innovator, and a machine learning expert. He is a co-founder and CEO of Nines, an AI-powered radiology-as-a-service solution. He has a history as an entrepreneur of developing and applying advanced technology in new ways to solve big problems.

Prior to Nines, David was co-founder and CEO of Udacity, which democratized education with the first global, online, lifelong learning platform. He was also a pioneer in autonomous vehicles, helping create the first complete robotic car, “Stanley”, and co-founding Stanford University’s self-driving car team, which was acquired by Google as the foundation for Waymo.

He holds a Ph.D. and M.S. in Computer Science from Stanford University, and received at age 19 a B.S.E. Computer Science, Magna Cum Laude, from Princeton University.

Alexander Kagen, MD

Chief Medical Officer

Dr. Alexander Kagen is a co-founder and Chief Medical Officer of Nines, an AI-powered radiology-as-a-service solution. Since 2015, he has also served as the Site Chair of Radiology at Mount Sinai West and Mount Sinai Morningside Hospitals in New York City and is Associate Professor of Radiology at the Icahn School of Medicine at Mount Sinai.

Dr. Kagen is a recognized authority in the field of Body MRI and was named as one of New York’s Top Doctors for 2019 by New York Magazine. He serves on local, national and international committees and has lectured both nationally and internationally on the imaging of liver disease, prostate, and gastrointestinal and pancreaticobiliary MRI.

He was a past chair of the Radiology-Pathology working group of the American College of Radiology Liver Imaging and Reporting Database System, and is a member of the ACR Magnetic Resonance Prostate Imaging and Reporting Database System Committee.

Dr. Kagen received his medical degree from the College of Medicine at SUNY Downstate Medical Center where he also completed his residency, after a medicine internship at Lenox Hill Hospital. He completed a clinical fellowship in Body MRI at Johns Hopkins Hospital in Baltimore.

Our Leadership

Corey Hart
Head of Engineering - Clinical

Corey leads Clinical Engineering at Nines, coordinating integration of radiology workflows to provide the best healthcare experience. Prior to Nines, Corey led Mobile and Front End Engineering teams at SafeXai focusing on bringing real time information to emergency operation centers.

Greg Stock
VP of Talent

Greg leads recruiting and human resources at Nines. Previously, Greg was the Head of Talent at molecular diagnostics company Karius Inc. Before Karius, Greg was the Head of Recruiting at Polyvore pre-acquisition by Yahoo! Earlier in his career, Greg built and deployed global talent programs while at Cisco Systems. Greg attended the University of California, San Diego.

Joel Kronander
Head of Engineering - Machine Learning

Joel leads the machine learning engineering team at Nines, working closely with Nines radiologists and clinical leadership to develop the best AI tools to improve the healthcare experience.  Prior to Nines Joel worked on large scale machine learning problems at Apple as a Computer Vision Engineer. Joel holds a M.S. in Electrical Engineering and Applied Physics and a Ph.D. in Computer Graphics from Linköping University, Sweden.

Jonah May
Head of Product

Jonah leads the product team at Nines, working with clinicians and engineers to develop the healthcare practice of the future. Prior to Nines, Jonah developed patient-facing digital health products at Mango Health (acquired by TrialCard). Jonah has also been a Product Fellow at Kleiner Perkins, and he holds an undergraduate degree in Computer Science from Princeton University.

Maureen Bradford
Chief Revenue Officer

Maureen leads Nines business growth, spanning sales and marketing. Previously, she was VP at fleet management platform KeepTruckin. Maureen led teams at Google as Director of Marketing for Google Cloud and for Google Ads Platform. Maureen also held leadership roles at Intel including Director of the Intel Inside Program. She’s a graduate of the University of Michigan and holds an MBA from the Wharton School at the University of Pennsylvania.

Max Ochoa
CFO and General Counsel

Max leads Nines's finance and legal departments. Prior to Nines, Max was CFO and GC for Alation, Inc. where he led finance, HR, legal, and IT. Before Alation, Max was general counsel, corporate secretary, and chief privacy officer for Turn Inc. He holds an SB in Aeronautics and Astronautics from MIT, an MS in Aerospace Engineering from The University of Michigan, and a JD from Stanford Law School. Max serves on the Board of OneJustice, a California social justice not-for-profit.

Mike Kelleher, MD
President & CEO, Nines Radiology PA, PC

Mike leads the Nines Radiology practice, coordinating the clinical practice and relationships with health care provider clients, using technology and practices to improve the healthcare experience. Previously he was Vice Chair of Radiology at Middlesex Health and Chief Operating Officer of Guilford Radiology, a radiologist-owned private imaging center. Mike graduated from the University of Connecticut School of Medicine and completed his residency and pediatric radiology fellowship at Yale Medical School.

Our Advisors

Burton Drayer, MD

Dr. Drayer is the Dean of Clinical Affairs, Professor and System Chair, for all Mount Sinai Hospitals and former President & Board Chair of RSNA.

Curtis Langlotz, MD, PhD

Dr. Langlotz is Professor of Radiology and Biomedical Informatics and Director of the AIMI Center at Stanford University Medical Center.

David S. Mendelson, MD

Dr. Mendelson is a Professor of Radiology and the Vice Chair, Radiology IT for all Mount Sinai Hospitals.

In Memoriam: Sam Gambhir, MD, PhD 1962-2020

Dr. Gambhir was Professor and the Chair of the Department of Radiology at Stanford University Medical Center. He was past President, International Society for Strategic Studies in Radiology (IS3R).

Keith Bigelow

Keith is GM of Analytics and Reporting at Workday, and previously has been GM of Analytics at GE Healthcare and SVP & GM of Analytics at Salesforce.

Kim Hammonds

Kim is a board member at Zoom, Box, Cloudera, Tenable and former COO of Deutsche Bank. She is a Senior Advisor to Nines.

Matt Lungren, MD, MPH

Dr. Lungren is Assist. Prof. of Radiology and Co-Director, Center for Artificial Intelligence in Medicine and Imaging at Stanford University Medical Center.

Max Wintermark, MD, MBA

Dr. Wintermark is a Professor and the Chief, Neuroradiology Division at Stanford University Medical Center.  He is the Chair of the Research Committee for the American Society of Neuroradiology (ASNR).

Melissa Davis, MD, MBA

Dr. Davis is a Nines Advisor on Clinical Operations and is an Assistant Professor at Emory University School of Medicine. Previously Dr. Davis was Chief of Emergency Radiology and Clinical Lead, Center for Outcomes Research and Evaluation at Yale University School of Medicine.

Michael Ovitz

Michael is founder of Broad Beach Ventures. He previously co-founded Creative Artists Agency (CAA) and served as its Chairman until 1995. Michael also was President of the Walt Disney Company. He served as Chairman of the Executive Board of the UCLA Hospital and Medical Center and also serves on the boards of several other organizations.

Thomas Montine, MD, CM, PhD

Dr. Montine is a Professor and the Chair of the Department of Pathology at Stanford University Medical Center. He is also the former President, American Association of Neuropathologists.

About Nines

Quality Focus and Differentiated Approach

In the News

June 7, 2021
Dr. Mike Kelleher, CEO of Nines Radiology: I believe that technology, particularly artificial intelligence (AI), could solve much of the administrative tasks that have held us back from our most important role — caring for our patients. We’re seeing this in my current practice at Nines Radiology. We apply AI and machine learning to help our radiologists regain their love for medicine. We brought on full-time engineers and had them work with our radiologists to uncover new ways of improving clinical workflows. Together, they harnessed the power of machine learning to develop a solution for batching reports so radiologists are not wasting time looking for various studies.

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April 26, 2021
Nines helps physicians and radiologists diagnose diseases faster. For example, its AI-based tools can measure lung nodules that accelerate diagnoses of certain respiratory diseases. This reduces the amount of time radiologists spend measuring pulmonary nodules and speeds the diagnosis for patients. By saving precious time otherwise spent on administrative and non-diagnostic tasks, the company says its technology allows imaging centers and hospitals to turn patients around faster.

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April 9, 2021
“Setting up an ergonomic reading room is actually quite simple but requires a bit of planning,” says Mike Kelleher, MD, a radiologist and the medical director for Nines Radiology, based in Palo Alto, California. “When planned thoughtfully, radiologists will be able to maximize their quality and productivity, optimizing one’s longevity and ability to provide the best possible care for our patients.”

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April 1, 2021
We cover AI approvals in just about every Imaging Wire issue, so here’s why this one is different...a lot of what Nines is doing is unique and worth watching

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March 31, 2021
With this clearance, Nines also augmented its product offerings that have led to significant improvements in non-diagnostic workflow and fewer distractions by administrative tasks

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March 31, 2021
The FDA has given the all-clear to AI software that measures nodules in the lungs, a tedious but important task for radiologists monitoring changes in these growths over time. Teleradiology provider Nines announced the 510(k) clearance March 30. The Silicon Valley company says the tool lets radiologists spend less time measuring lung nodules so they can make diagnoses faster and attend to other duties sooner. The regulatory clearance follows less than a year after Nines earned a go-ahead for two neurodiagnostic AI applications.

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March 30, 2021
Radiologists can utilize NinesMeasure to measure the long and short axes of selected nodules, according to the company. It can also help to address interstudy consistency over the course of a patient's treatment program, Nines said.

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March 30, 2021
“Lung nodule measurement can be tedious and time-consuming as each nodule has to be measured carefully to determine changes in size over time,” Joel Kronander, Nines’ head of engineering and machine learning, told BioWorld. “Ninesmeasure enables radiologists to quickly measure the long and short axes of selected nodules with a high level of accuracy.”

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March 30, 2021
The FDA clearance for NinesMeasure is the second FDA clearance in 10 months for the Silicon Valley based teleradiology practice, demonstrating the company's commitment to transforming the use of technology in radiology.

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March 30, 2021
The tool, which was developed by a collaborative team of radiologists and engineers, can help radiologists accelerate the measurement of pulmonary nodules, improving time to diagnosis for certain respiratory conditions.

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September 2, 2020
A list of the candidates for the 2020 edition of the Minnies, AuntMinnie.com's campaign to recognize the best and brightest in medical imaging. Nines is recognized as a Semifinalist in the category of Best New Radiology Software. Final winners will be announced in October.

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August 28, 2020
Radiologists identified the efficiencies of telemedicine well before the remote work boom. Even in radiology, which has a major leg up on telemedicine adoption, it can take time to determine which state-of-the-art tools outweigh others.

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August 26, 2020
...He was joined in discussion by Russell Stewart, a vice president at teleradiology and AI startup Nines, and Hugh Harvey, a managing director at clinical digital consultancy Hardian Health. Stewart and Harvey noted the distinct regulatory differences separating algorithms from drugs and medical devices: While drugs and devices take years to develop and are not easily altered once approved, algorithms can be changed with a few keystrokes, making lasting regulation a challenge. Both panelists encouraged exacting language in describing the intended use of a product under regulatory scrutiny. Keep the scope narrowly focused and don’t overreach, cautioned Harvey. Stewart meanwhile counseled working collaboratively with regulators through the development process to help get technologies to market.

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July 6, 2020
As there is more care needed, there has to be a way to move funds to COVID treatment and things like that. And so, making care more efficient without reducing quality — that is also, I think, a driving factor for change. I think it's important, even in these times, to move fast but also move with purpose and move with quality, accuracy and safety.

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June 3, 2020
NinesAI uses a prioritization method to assist in identifying ICH and mass effect in emergent cases. As Stavens explains, radiologists typically receive images in the order in which they were captured. However, this “first in, first out” method doesn’t take condition severity into account.

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June 2, 2020
VCs from 11 top firms share how coronavirus is transforming their healthcare investing strategies. "Accel judges investments based on the right set of demands and a company's founders and product, according to Kumar. He cited Nines Radiology, a startup founded by scientists that speeds up radiology reads, as an example."

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May 30, 2020
Checking the brain. Artificial intelligence company Nines landed FDA clearance for its new tool.

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May 27, 2020
Meet the 26 healthcare startups that top VCs say are poised to take off amid the coronavirus pandemic

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May 22, 2020
The move appears to be working, with an overall drop in duplicate CT of specific anatomic regions that include the thorax, abdomen, and head, wrote Melissa Davis, MD, MBA, and colleagues with Yale University School of Medicine. “These successes support recent CMS policy initiatives to retire duplicative imaging measures from public reporting..."

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May 21, 2020
AI-Powered Teleradiology FDA Cleared for Triage in Departments Swamped by COVID-19: Interview with David Stavens, CEO of Nines

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May 4, 2020
Nines’ team includes world-class radiologists and top Silicon Valley engineers devoted to relieving burdens via more efficient workflows that positively impact patient care.

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April 30, 2020
“We think that this technology is particularly important because we are seeing the demand in terms of studies growing much more quickly than the number of radiologists.”

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April 30, 2020
Nines Receives Unprecedented FDA Approval Enabling Democratized Access To AI-Enabled Radiology In The Telehealth Era

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April 30, 2020
FDA-cleared AI-based medical triage tool goes free for customers to help busy radiology diagnostics departments

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December 4, 2019
Teleradiology startup comes out of stealth mode...“We think we are the first company to blend the best AI and machine learning with the best radiologists. We think that you need both,” Stavens said.

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November 27, 2019
A self-driving-car pioneer teamed up with a doctor to create a healthcare AI startup that just raised $16.5 million to upend radiology

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In addition to the FDA clearance for its lung nodule measurement tool, Nines also announced that its recent focus on improving clinical workflow has demonstrated a 40% gain in efficiency over three months. Nines radiologists are seeing reduced interruptions from non-diagnostic workflow automation, from one-click communications with Emergency Room physicians to an "always-ready" worklist of studies.

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General Inquiries

Interested in partnering with or working at Nines? We'd like to hear from you. Let us know and we'll respond promptly.

This form is not intended to provide medical care or answer patient related questions. If you're a patient and have questions about your imaging study or medical care, please contact your medical provider.