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Dr. Johnstone received his MD degree from the Uniformed Services University of Health Sciences, Bethesda, MD. He completed a Transitional Internship at National Naval Medical Center and a Radiation Oncology Residency at the National Cancer Institute. Dr. Johnstone served in the United States Navy, retiring in 2003. He then served as Professor of Radiation Oncology and Hematology/Oncology at Emory University School of Medicine from 2003-2007. He was Director of the Survivorship Program at the Emory Winship Cancer Institute during this period. Dr. Johnstone was appointed as Chair and William A. Mitchell Professor of Radiation Oncology at Indiana University School of Medicine in 2007. He was also assigned as President and Chief Executive Officer of the IU Health Proton Therapy Center, and Director of the Indiana University cyclotron. He assumed responsibilities as Clinical Director and Vice Chair at Moffitt in 2014. Dr. Johnstone has clinical interest in pediatric, and genitourinary malignancies and sarcomas. His recent clinical trials have involved acupuncture as symptom control in cancer patients, and his recent publications have dealt with the use of proton radiotherapy in children. He is a Fellow of the American College of Radiology and serves on the ACR Board of Chancellors. In 2007 he was President of the Society for Integrative Oncology, and in 2011 was President of the American Radium Society.
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