Dr. Lewin is the Martin Donner Professor and Chairman of the Russell H. Morgan Department of Radiology and Radiological Science at Johns Hopkins University, and the Radiologist-in-Chief at Johns Hopkins Hospital, with secondary appointments as Professor of Oncology, Neurosurgery, and Biomedical Engineering.

Dr. Lewin received his undergraduate degree in Chemistry from Brown University in 1981  and his Doctor of Medicine from Yale University in 1985.

Following his internship at Yale-New Haven Hospital and residency in Diagnostic Radiology at University Hospitals of Cleveland, he completed a Magnetic Resonance Research Fellowship in Germany, a Neuroradiology fellowship at the Cleveland Clinic, and additional training in Head and Neck Radiology at the Pittsburgh Eye and Ear Hospital.

Prior to his current position, he was the Director of the Division of Magnetic Resonance Imaging and Vice Chairman for Research and Academic Affairs in the Department of Radiology at Case Western Reserve University and the University Hospitals of Cleveland.

He has been a pioneer in interventional and intra-operative MR imaging, and has published more than 165 peer-reviewed manuscripts, over 40 chapters and invited papers, and more than 300 peer-reviewed abstracts on topics including the basic science and clinical aspects of interventional MR imaging, functional MR imaging, head and neck imaging, MR angiography, small animal imaging, and the imaging of acute stroke.

Dr. Lewin has been PI and Co-PI on NIH and other Federal and State grants with awards of over $10 million in direct costs, as well as a co-investigator on a number of other grants and projects. He has given over 100 invited lectures in nine countries on a number of topics in Magnetic Resonance Imaging, has served on numerous national committees, editorial boards, and grant review groups for foundations and the NIH, and has served on the Task force on Minimally-Invasive Cancer Therapy for the National Cancer Institute.

Currently, he is on the Board of Chancellors of the American College of Radiology and serves on the Board of Directors or Executive Committees for the American Roentgen Ray Society, Association of University Radiologists, Society of Chairs of Academic Radiology Departments, Academy of Radiology Research, International Society for Strategic Studies in Radiology, and several other national and international organizations.