Dr Zietman is currently Shipley Professor of Radiation Oncology at Harvard Medical School and has recently finished his term as President and Chair of the American Society for Radiation Oncology (ASTRO).
He received his undergraduate training at Oxford University in the UK and then went to medical school at the Middlesex Hospital, London University graduating in 1983.
After residencies in internal medicine and clinical oncology he moved to the Massachusetts General Hospital in Boston, USA for a fellowship in radiation biology. Since joining the staff he has authored over 100 original articles and reviews on many aspects of GU cancer. His particular research interests are in the specific roles of active surveillance, brachytherapy, hormone therapy, and proton beam therapy in the management of prostate cancer. He also has a long-standing interest in the organ-sparing treatment of bladder cancer.
He is a Trustee of the American Board of Radiology and, since 2011, has been editor of the International Journal of Radiation Oncology Biology Physics.