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

Alex Noe
VP, Product / Business

Alex is an experienced leader in bringing revolutionary products to market. Before Nines, Alex was the Head of Product for Salesforce Inbox, one of the fastest growing products and the first AI product at Salesforce. Earlier in his career, he was with the Boston Consulting Group.

Greg Stock
VP, 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.

Maureen Bradford
Chief Marketing Officer

Maureen leads Nines 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. Mike graduated from the University of Connecticut School of Medicine and completed his residency and pediatric radiology fellowship at Yale Medical School.

Mike Rabern
VP, Growth

Mike brings decades of teleradiology experience to the Nines team. Mike was a Director at Virtual Radiologic, and is excited about the future of radiology that Nines can deliver to patients and clinicians across the world. Mike is also a veteran, serving in the United States Navy. 

Paul Twohey
VP, Engineering

Paul is a serial founder and leads engineering at Nines. Previously, he led engineering at ClassPass after that company acquired fitmob, which he co-founded. He also co-founded Ness Computing, which was acquired by OpenTable. He was an early software engineer at Palantir where he designed and implemented the first version of the Palantir geospatial search engine.

Russell Stewart, MD, MBA
VP, Clinical Affairs

Russell leads Clinical Affairs at Nines and is a Clinical Assistant Professor of Radiology at Stanford. He completed the diagnostic radiology residency program and the musculoskeletal radiology fellowship program at Stanford University. Before Stanford, Russell received his medical degree from the Pritzker School of Medicine at the University of Chicago, an MBA from the Booth School of Business at the University of Chicago, and an M.S. and B.S. in biology from Stanford University. He also played for the Seattle Seahawks of the National Football League.

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 is a Professor and the Chair of the Department of Radiology at Stanford University Medical Center. He is the immediate 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

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

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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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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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