Health Data Analytics Institute logo
Request demo

Category: Josh Gray

Skin Substitutes: A Cost Nightmare That Could Still Hurt ACOs

By Josh Gray and Maria Monahan The skin substitute cost explosion of 2022 – 2025 should be behind us. But it continues to hang over the finances of ACOs. Skin substitutes are expensive wound care products made from human placenta and other biologicals. The cost of some of these products exceeded $21K per square inch; […]

Hidden in Plain Sight – The Cost of ACO Leakage

Graphic for Josh Gray blog post 7.12.25

By Josh Gray and Maria Monahan Many major hospital and health systems have launched Accountable Care Organizations (ACOs) through Medicare’s Shared Savings Programs (MSSP).  Leakage – patients receiving care from competing hospitals or specialists – can be a substantial challenge for health system-affiliated ACOs. Out-of-network visits limit an ACO’s visibility, making both cost control and care coordination […]

Scott Cullen MD
Chief Medical Officer

Dr. Scott Cullen has more than two decades of experience advancing clinical innovation, digital transformation, and value-based care. He has held senior leadership roles across health systems and consulting firms where he guided organizations in adopting data-driven, patient-centered care models. As Chief Medical Officer at HDAI, Dr. Cullen helps shape AI-enabled solutions that improve clinical outcomes. His work is grounded in his early career as a practicing physician, a frontline perspective that continues to drive his passion for building technology that empowers clinicians and humanizes healthcare.

Bill Floyd
VP Sales

Bill brings a lifetime of curiosity, discipline, and humor to HDAI. Married for more than 40 years, he is a proud father of three and grandfather to one and shares his home with two dogs—one a rescue—while firmly maintaining a no-cats policy.

An oyster farmer by trade (despite not being an oyster eater or much of a shucker), Bill’s path reflects an appreciation for hard work. He is passionate about business, lifelong improvement, and thoughtful problem-solving, often delivered with a healthy dose of sarcasm.

Raphael Cohen
VP AI and Engineering

With expertise in machine learning, cloud computing, and healthcare, Raphael translates complex technical challenges into practical healthcare solutions. He’s pioneered ML platforms to drive innovations in radiology, pathology, and anesthesia while simultaneously improving operational efficiency and scale. Outside of work, he’s an avid cyclist who regularly participates in the Pan-Mass Challenge, enjoys hiking the White Mountains, and is often found playing guitar. He received a BS in Computer Science and Applied Mathematics from Brandeis University.

Bob Scott
VP Security, Compliance, and IT Operations

Bob has 20 years experience enhancing IT systems and security programs in regulated companies.  He has worked with global enterprises down to 10-person start-ups.  He currently holds both CISSP and CCSP certificates from ISC2.  Bob’s professional passion is negotiating the sweet-spot between Security, Efficiency and Company Resources.  Personally, Bob is a land-locked boatsman who laments every day away from the water and an avid table-top gamer.  He received a BS in Microbiology from Cornell.

Summer Kramer
VP Clinical Programs

Summer is a clinical pharmacist with over 15 years of experience in the healthcare industry, including hospitals, payors, and start-ups. Summer has focused her career on clinical program development and healthcare analytics with a constant drive to improve patient outcomes.

Residing in the pacific northwest, Summer enjoys hiking, camping, sailing, and traveling. She received her PharmD from the University of New Mexico, College of Pharmacy.  

Kevin Sampson
VP Finance

Kevin is a CPA with 25 years of executive and managerial experience in accounting, corporate finance, and operations in a variety of industries including medical device, biotechnology, and pharmaceuticals.

By listening and connecting with people, Kevin understands that accurate timely information is vital for everyone in the healthcare system. He received a BS in Accounting and an MBA in Finance and Entrepreneurial Studies from Babson College.

Paul Manberg
VP Clinical and Regulatory Affairs

Paul is an innovative, pragmatic leader with over 40 years’ experience in the medical device and pharmaceutical industries. He has directed clinical trial programs and regulatory activities supporting the successful market introduction of numerous impactful products. He spends his leisure time on the Outer Banks of North Carolina, body surfing and fishing. He received a PhD in pharmacology from The University of North Carolina School of Medicine.

Scott Greenwald
Chief Scientist

With over 25 years’ experience in healthcare research and innovation, Scott is an unprecedented leader in his field, focusing on improved care for everyone. He is an author of over 10 US Patents and over 100 peer-reviewed abstracts and manuscripts. While he’s not immersed in research, you’ll find him playing a mean round of mini golf. He received a PhD in Medical Engineering from the Harvard-MIT Division of Health Sciences and Technology (HST).

Josh Gray VP Analytic Services

Josh has 30 years’ experience in healthcare, including The Advisory Board Company, athenahealth, and Boston Consulting Group. Across his career, he has used a wide range of conventional and unconventional data sources to understand and teach the keys to top performance among the nation’s most innovative health systems and physician groups. Josh enjoys music, hiking, traveling, and watching his daughter take part in synchronized skating competitions. He received an MBA from The Wharton School at the University of Pennsylvania and an undergraduate degree from Brown University.

Carola Endicott
VP Customer Engagement, Marketing

Carola has 30 years’ experience in healthcare, including HMOs, hospitals, and start-ups. Her knowledge and optimistic outlook in operations and leadership, and her passion for making healthcare workers’ lives easier is what drives her devotion to customer engagement. She received an EdM from Harvard University Graduate School of Education.

David Clain Chief Product Officer

David has vast experience with healthcare customers from his time at The Advisory Board Company and athenahealth. His expertise and passion for statistics, strategy, and innovative analytic insights is unrivaled, as is his devotion to the Duke Blue Devils. Looking for that “aha moment” of positive change is what drives him. He received a BA from Duke University.

Margie Ahearn
VP HR

Margie has 25 years of experience in HR leadership. An avid boater, Margie has received numerous awards for excellence in HR and is always looking for challenges to grow professionally and personally. She graduated with an MBA from Southern New Hampshire University.

Nassib Chamoun
Founder and CEO

Nassib is a data scientist, lover of logistical regression and a serial entrepreneur. Previously, he was Founder and CEO of Aspect Medical Systems, a Nasdaq traded company now owned by Medtronic. Outside of work, he enjoys hosting and honing his cooking skills – specializing in Middle Eastern and outdoor feasts. He received an MS from Boston University.

Phil Devlin
COO

Phil has 30 years of experience in executive leadership. Along his journey he’s made effective and profound change in science. Little known facts about him — he loves traveling with his family, he was in the MD Engineering program at Harvard Medical School and owns 15 patents. He received an MS from Northeastern University.

What guides our culture

1

We are driven to make a profound impact on US healthcare

2

We operate in the best interests of patients and those who serve them

3

We understand and protect patient privacy and health information security

4

We use data science to enhance, but never replace clinical expertise and judgment

5

We are committed to continuous learning and improvement

6

We bring rigor, discipline, and reliability to our work

7

We start with kindness, assuming good intent in others

8

We are committed to building a diverse, inclusive team where all employees feel welcomed and appreciated

9

We are committed to the well-being of our employees and their families

Our vision

We envision a healthcare system where decisions are routinely informed by personalized care profiles and predictive analytics, which will improve the health of individuals and populations.

Our mission

Deploy a versatile analytic platform that creates a shared understanding of quantified health risks to inform actions with the greatest potential to benefit patients.

Who we are

We collaborate with leading health systems and integrated delivery networks, value-based care and accountable care organizations, physician groups, and commercial payers to improve care delivery and population health while reducing costs and making efficient use of scarce clinical resources.

Phil Devlin
COO

Phil has 30 years of experience in executive leadership. Along his journey he’s made effective and profound change in science. Little known facts about him — he loves traveling with his family, he was in the MD Engineering program at Harvard Medical School and owns 15 patents. He received an MS from Northeastern University.