Medical leadership team

Dan Durand, MD, is the Chief Medical Officer at Prenuvo, where he leads the clinical and operational teams, oversees clinical research, and serves as President of the Prenuvo Medical Group. Before joining Prenuvo, Dr. Durand held multiple leadership roles at LifeBridge Health, including Chief Clinical Officer and Chief Innovation Officer, where he spearheaded initiatives in value-based care, digital health, and clinical AI. He was also the founding leader of LifeBridge’s Clinically Integrated Network, a network of over 2,000 providers across five hospitals.

Dr. Durand’s career includes leadership positions at Johns Hopkins Medicine, Evolent Health, and consulting with McKinsey & Company. He is an adjunct faculty member at Stanford University and George Washington University, with a courtesy appointment at Johns Hopkins Carey Business School. Dr. Durand trained at the Johns Hopkins University School of Medicine and is board-certified in both adult and pediatric radiology.

Ty Vachon, MD is the Vice President of Quality, Safety and Informatics at Prenuvo. He is a practicing radiologist and has extensive leadership and clinical experience with recent emphasis in AI in medical imaging. He has worked over a decade in clinical informatics and provider quality assurance systems with data driven development and process driven implementation. He brings this experience to provide the highest clinical quality and safety to the Prenuvo patients.

Sean S. London, MD is the Interim Vice President of the US Radiology Practice. In this role, Dr. London is dedicated to advancing the Prenuvo radiology practice, with a focus on providing accurate, high-quality radiology service to our patients and healthcare providers.

Vikash C. Modi, MD is the Senior Medical Director of Preventative Medicine at Prenuvo. In his role, Dr. Modi has been working to develop an integrated program that addresses the irregularities found on preventive screening MRIs in a manner that is understandable to patients and manageable to primary care teams.

Yosef “Sefi” Chodakiewitz, MD, serves as the Medical Director of Primary Care Radiology and the Founding Medical Director of Clinical Research at Prenuvo. Dr. Chodakiewitz directs the Hercules Project—a 10-year clinical study with the goal of enrolling 100,000 participants for proactive WB-MRI screening, coupled with longitudinal follow-up to evaluate diagnostic accuracy and long-term health outcomes. This ambitious initiative exemplifies Prenuvo’s commitment to using advanced imaging as a transformative tool for primary prevention and early intervention.

Dr. Chodakiewitz completed medical school at Brown University, followed by a radiology residency at Cedars-Sinai and a fellowship at Stanford’s Body MRI Division and Minimally-Invasive MR Interventional Center (MIMRIC). There, he developed expertise in advanced MRI techniques, including performing WB-MRI for cancer screening in high-genetic-risk individuals, as well as tailoring protocols for evaluating known cancers and other complex cases.

Sarah Colson, NP-C, AOCNP, RT(R)(CT)(MR) is the Director of Advanced Practice Providers (APPs).  With an extensive clinical background in oncology and MRI, Sarah plays a pivotal role in the management, development and integration of Nurse Practitioners at Prenuvo.  Sarah brings a blend of strategic vision and practical insight to enhance patient care delivery and overall quality of the Prenuvo experience.

Dr. Giuliana Zaccardelli, MD, MBA is Chief of Staff for Prenuvo Clinics, where she leverages her expertise to drive innovation in preventive, personalized healthcare. She previously cofounded a digital health company focused on women’s health and worked as a Health Economics and Outcomes Research Analyst at Analysis Group. Giuliana holds an MD and MBA from Northwestern University.