James Joseph Thompson, DO

Dr. Swenson specializes in pediatric radiology at Johns Hopkins All Children’s Hospital in St. Petersburg, Florida. He joined the hospital in 2025.  He was previously employed as a radiologist at Rhode Island Medical Imaging in Providence, RI for more than 10 years, during which time he served as an associate professor of Diagnostic Imaging, clinician educator at the Warren Alpert Medical School of Brown University.  His roles included clinical work in pediatric, musculoskeletal, and adult emergency radiology, as well as departmental leadership in Quality and Operations.   Dr. Swenson earned his medical degree from the Perelman School of Medicine at the University of Pennsylvania. He completed a medical internship at Abington Memorial Hospital in Pennsylvania, followed by a radiology residency at Warren Alpert Medical School of Brown University in Providence, Rhode Island, where he also served as chief resident. He then completed a fellowship in pediatric radiology at Boston Children’s Hospital / Harvard Medical School.

Dr. Masseaux is a pediatric radiologist at Johns Hopkins All Children’s Hospital. She sees patients at the hospital’s main campus in St. Petersburg, Florida. She joined the hospital staff in 2023.She was previously an assistant clinical professor of radiology and pediatrics at Mount Sinai Medical Center in New York. Dr. Masseaux earned her medical degree and Master of Public Health from Harvard Medical School. She completed an internal medicine internship at Cabrini Medical Center in New York. She then completed a residency in diagnostic radiology at New York and Presbyterian Hospital-Weill Cornell Medical Center in New York, followed by a fellowship in pediatric radiology at Children’s Hospital of Philadelphia. Dr. Masseaux’s return to Johns Hopkins Medicine also represents a full circle moment as she earned her undergraduate degree at Johns Hopkins University.