MDCalc co-founder Graham Walker returns as head of artificial intelligence. September 14, 2026 Graham Walker MDCalc has brought co-founder Dr. Graham Walker back to the company full time as head of artificial intelligence, creating a new leadership role focused on the use of AI in clinical decision-making and the operational and ethical risks that come with broader adoption across healthcare. Walker co-founded MDCalc with fellow emergency physician Dr. Joseph Habboushe in 2005. He returns after nearly two decades with The Permanente Medical Group, where his work combined emergency medicine, clinical informatics and technology deployment across Kaiser Permanente's Northern California operations. His appointment comes as healthcare organizations increasingly incorporate AI into clinical workflows while confronting questions around accuracy, bias, physician oversight, liability and the potential loss of clinical skills. At MDCalc, Walker will help shape how the company approaches those issues while developing practical AI tools for physicians and health systems. "The potential of AI excites us tremendously at MDCalc," Walker said. "Across the country, physicians are already adopting tools that enhance their practice and create more time to concentrate on the patients in front of them." Walker cautioned that adoption also creates risks involving bias, de-skilling and liability, along with new ethical considerations for clinical care. MDCalc intends to focus its AI work on transparency, accuracy and fairness while exploring partnerships with other organizations working on responsible clinical AI. The initiative represents an extension of MDCalc's existing role in physician decision support. Millions of clinicians worldwide use the platform to access and interpret more than 800 clinical tools and algorithms at the point of care. Rather than treating AI as a separate technology initiative, MDCalc is positioning Walker's role around the same problem that led to the platform's creation: giving clinicians practical tools that can support decisions without replacing physician judgment. "What Graham and I got right is we were solving a real problem we knew well - always staying focused on what's best for patients and physicians," Habboushe said. He described the company's new AI work as a natural evolution of that approach. Walker brings direct experience implementing technology within a large healthcare delivery organization. Most recently, he served as co-director of advanced development at The Permanente Medical Group, which provides care to Kaiser Permanente's 4.6 million members in Northern California. As a clinical informaticist, he led emergency and urgent care strategy for Kaiser Permanente's electronic medical record while also working on AI development, commercialization, technology partnerships and broader transformation initiatives. He also helped lead technology and AI deployment across clinical care and worked on emergency and urgent care strategy for Kaiser Permanente's Epic electronic health record. His work on responsible AI predates the current MDCalc position. Walker was the lead author of the Physicians' Charter for Responsible AI, developed in 2023 as a practical framework for implementing AI in healthcare with an emphasis on safety, accuracy and fairness. At MDCalc, that background will inform efforts to address the practical safeguards required as AI tools become more integrated into physician workflows. The company expects the initiative to include collaboration with outside organizations addressing clinical AI risks and adoption challenges. "Our sights are trained on safeguarding clinical AI, emphasizing transparency, accuracy, and fairness," Walker said. "And we are eager to work with anyone who is focused on the same North Star." Walker is an emergency physician and clinical informaticist who earned his medical degree from Stanford University School of Medicine and completed his emergency medicine residency at St. Luke's-Roosevelt Hospital Center in Manhattan. His return gives MDCalc a dedicated AI leader with experience spanning frontline medicine, healthcare IT deployment and technology development. The company's next phase will center on translating those capabilities into clinical AI tools that can operate within real healthcare workflows while maintaining the trust and decision-making role of physicians.

Ryan Olohan joins MDCalc as Head of Sales. The Associated Press Sep 8, 2026, 10:13 AM Ryan Olohan joins MDCalc, trusted information provider to millions of physicians, as Head of Sales NEW YORK-(BUSINESS WIRE)-Sep 8, 2026- MDCalc, the physician-owned clinical decision support platform used by millions of healthcare professionals annually to assess their patients, today announced Ryan Olohan as Head of Sales, a newly created role focused on expanding MDCalc's commercial partnerships and supporting the company's next phase of progress. Ryan Olohan joins MDCalc, trusted information provider to millions of physicians, as Head of Sales MDCalc is celebrating its 20th anniversary with growth in mind - refining its clinical data, launching new initiatives, and extending its team in order to expand the MDCalc partnership model that allows physicians anywhere to efficiently access over 800 clinical decision tools in the palm of their hand for free. "We've earned the trust of fellow clinicians by providing critical decision tools at the point of care, and that relationship is the foundation of MDCalc," said Joe Habboushe, CEO of MDCalc. "That foundation is drawing talent like Ryan to us at exactly the right time. As we think about what comes next, we see an opportunity to build new partnerships that sustain that model while allowing us to support clinicians in new ways. Ryan understands healthcare, technology, and brands at an incredibly deep level, and he's exactly the kind of leader who can help us do that." Olohan brings decades of experience building and leading commercial organizations across technology, healthcare, consulting, and digital media. He spent 16 years at Google, including serving as Managing Director for Healthcare, where he helped transform the company's Pharma & OTC business. In that role, Olohan and his teams worked with many of the world's largest life sciences companies to leverage platforms and capabilities across Google and Alphabet. He also founded the Google Healthcare Advisory Board and co-authored Pharma 3D, developed in partnership with Google, McKinsey, and Wharton. Prior to joining MDCalc, Olohan also served as Executive Vice President of Partnerships at Klick Health. His healthcare leadership has been recognized by MM&M, which named him a Top 40 Healthcare Transformer, and PRWeek, which twice named him among its Top 50 Healthcare Influencers. Outside of his day job, Ryan, his wife, and seven children run a coffee/ice cream shop called Seven Scoops & Sips that donates the proceeds to local and global causes while also employing people with disabilities. "Once Ryan's experience met our vision, we knew there was real synergy," said Swarna Chatterjee, Chief Commercial Officer at MDCalc. "He brings a rare combination of healthcare expertise, commercial leadership, and an understanding of how to build partnerships that create value for both physicians and industry. As a team, we're ready to expand our outlook and build on our commercial organization and partnerships to advance into our next phase of growth." "There are very few healthcare organizations that have earned the kind of daily trust MDCalc has with clinicians," said Olohan. "What excites me is the mission - doing what's right and what works for clinicians and their patients - by showing how choosing and using the right clinical algorithms arms them with the knowledge they need to best treat each unique patient they take care of - which is what this is all about." Olohan will report to Swarna Chatterjee and joins MDCalc effective immediately. About MDCalc Founded by two physicians to help their colleagues better treat patients, MDCalc is one of the most widely used clinical decision-support and predictive AI platforms in medicine. Millions of clinicians worldwide use the platform every year to access and understand over 800 clinical tools and algorithms that support decision-making at the point of care. [email protected] (267) 307-6617 KEYWORD: NEW YORK UNITED STATES NORTH AMERICA INDUSTRY KEYWORD: TECHNOLOGY PUBLIC RELATIONS/INVESTOR RELATIONS MARKETING OTHER TECHNOLOGY ADVERTISING COMMUNICATIONS HEALTH GENERAL HEALTH DATA MANAGEMENT PUB: 09/08/2026 09:13 AM/DISC: 09/08/2026 09:13 AM You May Also Like

MDCalc, a physician-owned clinical decision support platform, has appointed Ryan Olohan as its new Head of Sales. The role focuses on expanding commercial partnerships as the company celebrates its 20th anniversary. Olohan brings extensive experience from his 16 years at Google, where he served as Managing Director for Healthcare and helped transform the company's pharmaceutical and over-the-counter business. He also co-authored Pharma 3D in partnership with Google, McKinsey, and Wharton. Most recently, he served as Executive Vice President of Partnerships at Klick Health. MDCalc provides over 800 clinical decision tools to millions of healthcare professionals annually. The platform allows physicians to access these tools free of charge. Olohan will report to Chief Commercial Officer Swarna Chatterjee and has joined the company immediately.