Faculty 2024

Jon A. Jacobson, MD, FACR

Jon A. Jacobson, MD FACR is a board-certified musculoskeletal radiologist. His educational background includes radiology residency at Henry Ford Hospital and musculoskeletal fellowship at the University of California at San Diego. After working for 23 years at the University of Michigan as Division Director and Professor of Radiology, and then at the University of Cincinnati, Dr. Jacobson currently works at Lenox Hill Radiology in New York City and University of California, San Diego. Dr. Jacobson’s research interests include musculoskeletal ultrasound and MRI. His academic achievements include over 250 peer-reviewed publications and many invited national and international lectures or workshops. Dr. Jacobson has been a visiting professor on over 50 occasions, is President of the Society of Skeletal Radiology, and has received numerous teaching and mentoring awards, including the 2023 Distinguished Educator Award (American Roentgen Ray Society). He is also the author of the textbook “Fundamentals of Musculoskeletal Ultrasound,” which has been translated into 5 languages and is now in its third edition. Dr. Jacobson’s curriculum vitae can be found at www.jacobsonmskus.com.

Sandra J. Allison, MD, FACR

Sandra J. Allison, MD is a Board Certified Diagnostic Radiologist and the Director of Ultrasound for Washington Radiology, practicing in the Washington DC and Northern Virginia area. Dr. Allison specializes in Ultrasound with areas of expertise in musculoskeletal, gynecologic, and vascular imaging. She currently holds an Associate Professor of Radiology appointment at Georgetown University School of Medicine where she previously served as Radiology Residency Program Director and Chief of Ultrasound. Dr. Allison is a fellow of the American College of Radiology, the American Institute of Ultrasound in Medicine and the Society of Radiologists in Ultrasound. Dr. Allison completed her diagnostic radiology residency and fellowship in Ultrasound, CT and MRI, at Thomas Jefferson University Hospital in Philadelphia, PA.

Dr. Allison lives in Northern VA with her husband, a practicing Plastic Surgeon and Commander in the United States Naval Reserve. They enjoy traveling with their three adult children, a doctorate candidate son and twin daughters in college. When not at work, traveling or teaching, she tends to her golden doodles puppy, her sourdough starter named Gary, and several citrus trees that remain alive in spite of her best efforts.

Mark Cresswell, MBBCh, BSc, FRCPC, FRCR

Mark Cresswell is a musculoskeletal radiologist at St Paul’s Hospital, Vancouver, with a sub-special interest in imaging and treating sports injuries. He did his undergraduate training in anthropology and medicine in South Africa. He initially started specializing in anesthesia including pain management before moving to do his radiology residency at St Mary’s Hospital in London, UK and musculoskeletal fellowship in Oxford, UK. He moved to Vancouver in 2007 and had great fun co-managing imaging at the Vancouver Olympic and Paralympic Games in 2010. He still likes to get involved in “real” medicine and has been actively involved with Medecins Sans Frontieres for the past 17 years.

Victor Flores, MD

Dr. Victor H Flores is a Physical Medicine and Rehabilitation Specialist in Fort Worth, Texas. He graduated with honors from the Univ Cetec School of Medicine, Santo Domingo, Dom Rep.in 1981. He has more than 37 years of diverse experiences, especially in physical medicine and rehabilitation.

Jon Halperin, MD FABPMR DipSportMed RMSK

Jonathan S Halperin M.D. is the Chief of Physical Medicine and Rehabilitation at Sharp Rees -Stealy Medical Group in San Diego. He is board certified in Physical Medicine and Rehabilitation with a subspecialty certification in Sports Medicine in both the USA (CAQ-ABMS) and Canada ( DipSportMed CASEM). He has a certification in MSK ultrasound (RMSK) from the ARDMS

He specializes in providing care for patients with non-operative sports, musculoskeletal and spine conditions. He obtained his medical degree from Queen’s University in Kingston, Ontario Canada. He completed his residency in PM&R at Loma Linda University Medical Center. His main areas of interest are in sports and musculoskeletal medicine, applications of diagnostic and interventional musculoskeletal ultrasound, preventative and regenerative musculoskeletal care, and medical education.

He is an avid skier, surfer and recreational cyclist. He has worked as a medical volunteer at the Salt Lake City Paralympics in 2002 and the Vancouver Olympic games in 2010. He is an active member of the Canadian National Alpine ski team medical group and has provided care for Canada’s Olympic ski team since 1985.

Linda Probyn, MD

Dr. Probyn is an Associate Professor and Musculoskeletal Radiologist at the University of Toronto. She is the past Program Director and now the Vice-Chair of Education for the Department of Medical Imaging and the current Chair of the Specialty Committee for Diagnostic Radiology at the Royal College of Physicians and Surgeons of Canada. She has interests in ultrasound, sports injuries, trauma, osteoporosis and arthritis as well as teaching and education, including the use of ultrasound simulation. She has published several scholarly articles and presents her work and teaches at many National and International conferences.

Humberto Rosas, MD

Dr. Rosas is a professor (CHS) in the UW Department of Radiology, and is fellowship trained in musculoskeletal radiology. His expertise is in musculoskeletal procedures, and he is the director of the Musculoskeletal Intervention at UW Hospital. His special interests include spine injections, vertebroplasty, and tumor ablation, as well as MR of wrist injuries. He is board certified in Diagnostic Radiology.

Emma Rowbotham, MD, FRCS, FRCR

Dr Rowbotham received at BSc in medical Science at St Andrews University before moving to Emmanuel College, Cambridge University where she graduated in 2002 with MB BChir. She entered Radiology training at the Leeds Academy in 1996 and completed her Fellowship in Leeds in 2012.  Her first Consultant post was at the Royal United Hospital in Bath where she developed particular interests in both Sports Radiology, predominantly via the English Institute of Sport, and Rheumatological Imaging whilst working at the Royal National Hospital for Rheumatic Diseases.  She then moved back to Leeds in 2014 to take up her role as Consultant Radiologist and Honorary Senior Lecturer at the University of Leeds. Along with a team of three colleagues she now provides Radiology services in terms of both diagnostic imaging and guided injection treatments across the field of musculoskeletal radiology. Dr Rowbotham has a particular interest in Ultrasound imaging, both for diagnostic and interventional purposes and alongside three colleagues, provides imaging support for numerous sporting clubs within the North of England.  She has edited and co authored a text book for the FRCR 2a examination, authored several peer reviewed papers on musculoskeletal imaging and written 8 book chapters.

Marcos Sampaio, MD

Dr. Marcos Loreto Sampaio is an MSK radiologist and MSK section head at The Ottawa Hospital (ON, Canada). He is an Assistant Professor at the U.Ottawa since 2009, with cross-appointment in the Orthopedic Surgery Division. He has a particular interest in MSK ultrasound and MRI techniques. Research interests include imaging in neuromuscular disease, spondyloarthropathy, dynamic ultrasound, and Dixon MRI technique. In prior years, U. Ottawa students, radiology residents, and fellows awarded him as the best radiology teacher. He also holds a degree in Electronic Engineering and is an amateur musician in his spare time.