Joseph’s Hospital and Medical Center. Dr. Drosten’s expertise includes thoracic and cancer imaging. He is a member of the Society of Thoracic Radiology and the Radiological Society of North America. Dr. Drosten received his medical degree from the University of the Witwatersrand in South Africa, where he also completed his radiology residency. He then completed two fellowships, in thoracic imaging and oncologic and PET imaging at Harvard Medical School, the Dana- Farber Cancer Institute and the Brigham and Women’s Hospital.